单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. According to Henry Moore, why is sculpture more difficult to appreciate than other forms of art

A.It is often displayed outdoors.
B.It does not always represent an object.
C.It is three-dimensional.
D.It is done by relatively few artists.