Everyone should visit a lighthouse at least once. The most important reason for such a visit is to realize how our ancestors   battled nature with the basic tools they had . They had only basic ways of creating light , and yet they found a way of using this simple technology in isolated   places to save ships from hitting rocks . Secondly , visiting lighthouses will help us to understand the lives of lighthouse keepers .By their very nature , lighthouses were built on some rocks or cliffs . Thus , the lighthouse keepers often lived lonely lives . To walk around their small home , and imagine the angry storm outside beating against the walls , is to take a step towards understanding the lives they had. The reasons for a visit to a lighthouse are not all so backward-looking in time . It is true that lighthouses were built in _ places . But on a pleasant sunny summer day. This very isolation has a natural beauty that many people will love to experience . Therefore, with the gentle waves touching all round the lighthouse . the visitor is likely to think it is a world preferable to the busy and noisy modern life. Another reason for considering a visit is that the lighthouses themselves can be very attractive buildings . Mankind could often not be content just to put up a basic structure . but felt the need . even in such an isolated place , to build with an artistic touch . The result is a view for tired eyes to enjoy . Finally , lighthouses have a romantic attraction , summed up by the image of the oil-skin coated keeper climbing his winding stairs to take care of the light to warn ships and save lives . Lighthouses were often built with an artistic touch  _  .
to attract visitors to guide passing ships to give a pleasant sight to remember lighthouse keepers
Question: Everyone should visit a lighthouse at least once. The most important reason for such a visit is to realize how our ancestors   battled nature with the basic tools they had . They had only basic ways of creating light , and yet they found a way of using this simple technology in isolated   places to save ships from hitting rocks . Secondly , visiting lighthouses will help us to understand the lives of lighthouse keepers .By their very nature , lighthouses were built on some rocks or cliffs . Thus , the lighthouse keepers often lived lonely lives . To walk around their small home , and imagine the angry storm outside beating against the walls , is to take a step towards understanding the lives they had. The reasons for a visit to a lighthouse are not all so backward-looking in time . It is true that lighthouses were built in _ places . But on a pleasant sunny summer day. This very isolation has a natural beauty that many people will love to experience . Therefore, with the gentle waves touching all round the lighthouse . the visitor is likely to think it is a world preferable to the busy and noisy modern life. Another reason for considering a visit is that the lighthouses themselves can be very attractive buildings . Mankind could often not be content just to put up a basic structure . but felt the need . even in such an isolated place , to build with an artistic touch . The result is a view for tired eyes to enjoy . Finally , lighthouses have a romantic attraction , summed up by the image of the oil-skin coated keeper climbing his winding stairs to take care of the light to warn ships and save lives . Lighthouses were often built with an artistic touch  _  .
A. to attract visitors
B. to guide passing ships
C. to give a pleasant sight
D. to remember lighthouse keepers
Answer: