【单选题】

The passage presents information that would answer which of the following questions
A．(A) In what ways do the coastlines of Africa and South America differ from one another

B．(B) How much lighter than the substratum of igneous rock below them are the continental masses
C．(C) Is the rotation of the globe affecting the stability of the present-day continental masses
D．(D) According to Wegener's theory, in what direction have the Americas tended to move
E．(E) How does Wegener's theory account for the apparent immobility of the African continent