【正确答案】 A

【答案解析】Since the existence of the correspondences between the various coastal contours was used by Wegener as a basis for formulating his theory of continental drift, it can be inferred that the correspondences provide evidence for the theory. Choice B is incorrect. The passage does not indicate that Pangea's existence has been proved. Choice C is incorrect. It is the relative heaviness of sima, not the level or depth of sima, that suggested the possibility of the lighter continents drifting. Choice D is incorrect. Mobility rather than immobility would provide evidence for continental drift. Choice E is incorrect. The continents are lighter than the underlying sima.