Early mapmakers thought continents might have moved based on their observation of

A. magnetism

B. rock and fossil evidence

C. matching coastlines

D. earthquakes and flood

C. matching coastlines

Explanation:

The theory of continental drift was originally proposed in 1912 by German meteorologist and geophysicist Alfred Wegener (1880-1930), who formulated it based, among other things, on how they seemed to fit the shapes of the continents on each side of the Atlantic Ocean, such as Africa and South America. This had previously been speculated by some mapmakers.