How did new evidence found by Marie Tharp and Bruce Heezen add onto continental drift and create the theory of plate tectonics? A. They showed fossils of the same organism on multiple continents helped explain how continents float on the mantle.

B. They showed what the oceans’ floors looked like helped explain how continents move over time.

C. They proposed that continents are pieces of the Earth's crust floating on top of the mantle.

D. They proposed that mountain ranges at the edge of continents helped explain how continents used to fit together.