单项选择题It can be inferred from the simplicity of the example of the bowling ball and rubber sheet to describe Einstein’s theory that______.
A.this was how Einstein reached his conclusions
B.Einstein used this example to explain his theory to students
C.the theory is so complex that a more detailed example would not allow most people to quickly understand the general idea
D.any theory is just a way of trying to explain something for which there is no certainty, so a simple example is sufficient