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What clue supported the continental drift theory?

A. The denser oceanic plate slides on top of the less dense continental plate. B. The less dense oceanic plate slides past the denser continental plate. C. The denser oceanic plate slides under the less dense continental plate. D. The less dense oceanic plate slides under the denser continental plate. Me and my mom are trying to help my sister with this test that she failed, and we can't figure out this question. So if you guys can help, I'd really appreciate it!

Public Comments

1. The answer is C because C is the only correct answer check out this link for more information: http://geology.com/nsta/convergent-plate-boundaries.shtml having said told you the answer this is a very misleading question as neither of these were really "clues" that led to the belief and support the continental drift theory. This answer is evidence of the theory
2. The simple answer is C Oceanic crust is composed mostly of basalt that is denser than continental crust, composed mostly of granite and andesite, which are less dense. An example of where this occurs is on the west cost of South America, where the Nazca Plate (oceanic crust) is subducted under the South American Plate (continental crust) forming a deep ocean trench and causing a great deal of volcanic activity. Notice that is use the term crust, not plate. Because tectonic plates can contain both continental and oceanic crust. The North American Plate has both, as both then North American Continent (except for parts of California and Mexico) are on the same plate as the Western Atlantic Ocean.