PT 63 S4 Q20

Which one of the following would, if true, most help to support the ocean ... ...

Which one of the following would, if true, most help to support the ocean floor spreading theory?
(A) There are types of rock other than basalt that are known to distort compass readings.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2011 LSAT (PT 63): Reading Comprehension