On April 10, 1815, Mount Tambora in Indonesia erupted with great force. Fifty cubic kilometers of magma   flew from its peak   and a blanket of ash as thick as one centimeter fell over more than 500,000 square kilometers of Indonesia and the Java Sea. The eruption destroyed Tambora's peak and formed a hole six by seven kilometers wide. The eruption and resulting tsunamis killed 10,000 people. The agricultural loss and disease brought about by the thick ash caused the deaths of 82,000 more. Indonesia was rocked again in 1883. On August 26, a small volcano on an uninhabited island between Sumatra and Java, erupted. The eruption produced an ash cloud 80 kilometers high and was heard in Australia--4,800 kilometers away. The eruption also caused a tsunami, which pounded   the shores of Java and Sumatra--killing 36,000 people. In 1902, St. Pierre was a thriving   community and the largest town on the French colony of Martinique in the Caribbean Sea. Mont Pelee cast a shadow over the town from where it stood, eight kilometers to the north. The townspeople were used to the light continuous sounds of the mountain, but in May, 1902 Pelee started to get really unstable. Clouds of steam and ash poured from the volcano and on May 8, Pelee erupted. Superheated gas and steaming volcanic ash flew out, pouring down the mountain at high speed. Within seconds, the deadly gas cloud had destroyed the town of St. Pierre and incinerated everyone in it -- except one prisoner in a basement cell. It was the worst volcano disaster of the 20th century. We can know from this article that    _   .
no measures can be taken to protect people from a volcano eruption volcanoes usually caused a series of earthquakes sometimes a volcano can completely destroy a city volcanoes are much more violent than the earthquakes
Question: On April 10, 1815, Mount Tambora in Indonesia erupted with great force. Fifty cubic kilometers of magma   flew from its peak   and a blanket of ash as thick as one centimeter fell over more than 500,000 square kilometers of Indonesia and the Java Sea. The eruption destroyed Tambora's peak and formed a hole six by seven kilometers wide. The eruption and resulting tsunamis killed 10,000 people. The agricultural loss and disease brought about by the thick ash caused the deaths of 82,000 more. Indonesia was rocked again in 1883. On August 26, a small volcano on an uninhabited island between Sumatra and Java, erupted. The eruption produced an ash cloud 80 kilometers high and was heard in Australia--4,800 kilometers away. The eruption also caused a tsunami, which pounded   the shores of Java and Sumatra--killing 36,000 people. In 1902, St. Pierre was a thriving   community and the largest town on the French colony of Martinique in the Caribbean Sea. Mont Pelee cast a shadow over the town from where it stood, eight kilometers to the north. The townspeople were used to the light continuous sounds of the mountain, but in May, 1902 Pelee started to get really unstable. Clouds of steam and ash poured from the volcano and on May 8, Pelee erupted. Superheated gas and steaming volcanic ash flew out, pouring down the mountain at high speed. Within seconds, the deadly gas cloud had destroyed the town of St. Pierre and incinerated everyone in it -- except one prisoner in a basement cell. It was the worst volcano disaster of the 20th century. We can know from this article that    _   .
A. no measures can be taken to protect people from a volcano eruption
B. volcanoes usually caused a series of earthquakes
C. sometimes a volcano can completely destroy a city
D. volcanoes are much more violent than the earthquakes
Answer: