In the fourth paragraph, the author is primarily concerned withA．restating the main idea o

In the fourth paragraph, the author is primarily concerned with

A．restating the main idea of the passage

B．using research findings to make predictions

C．outlining the direction of future research

D．describing an additional aspect of a phenomenon

E．introducing a conflicting hypothesis

请帮忙给出正确答案和分析，谢谢！