I still remember the last time I went to the playground with two of my children. It had rained during the night and the playground was very muddy  . They had just put on clean clothes, so I was a little worried about the mud on the playground. It was not long before Kathy got her beautiful skirt dirty on the playground. She dug through the rocks. I was about to blame   her for getting her clothes dirty when she ran towards me with a smile on her face. When she got to me, she handed me a little heart-shaped rock and said, "Here, Mom! Here is a heart for you --just because I love you! Keep it!" With tears in my eyes, I thanked her. Should I blame her for getting her clothes muddy? No way! I still have that little heart-shaped rock. It is one of the best gifts that I have ever received. I realized that many times it was not necessary for us adults to worry about the small things our children did. Let them do what they'd like to. I will spend a lot more time on the playground with my children. I'm sure I will learn a lot from them. It makes me think of the days when my grandfather told me, "You would not enter the kingdom of happiness until you pretended   to be a small child." The author's grandfather's words imply that   _  .
children care more about happiness than adults adults can not share children's happiness children may find happiness more easily in life adults find it hard to know children's happiness
Question: I still remember the last time I went to the playground with two of my children. It had rained during the night and the playground was very muddy  . They had just put on clean clothes, so I was a little worried about the mud on the playground. It was not long before Kathy got her beautiful skirt dirty on the playground. She dug through the rocks. I was about to blame   her for getting her clothes dirty when she ran towards me with a smile on her face. When she got to me, she handed me a little heart-shaped rock and said, "Here, Mom! Here is a heart for you --just because I love you! Keep it!" With tears in my eyes, I thanked her. Should I blame her for getting her clothes muddy? No way! I still have that little heart-shaped rock. It is one of the best gifts that I have ever received. I realized that many times it was not necessary for us adults to worry about the small things our children did. Let them do what they'd like to. I will spend a lot more time on the playground with my children. I'm sure I will learn a lot from them. It makes me think of the days when my grandfather told me, "You would not enter the kingdom of happiness until you pretended   to be a small child." The author's grandfather's words imply that   _  .
A. children care more about happiness than adults
B. adults can not share children's happiness
C. children may find happiness more easily in life
D. adults find it hard to know children's happiness
Answer: