What was the central idea proposed by Alfred Wegener in his theory of continental drift?

The continents are stationary landmasses that have been fixed in place since Earth's formation.

The continents were once joined together in a single supercontinent and have since moved apart.

New continents are constantly being formed by underwater volcanic activity in the middle of the oceans.

The Earth's crust is made of several large plates that are always in motion, creating earthquakes and volcanoes.

What was a major reason that Alfred Wegener's theory of continental drift was not widely accepted by the scientific community for many decades?

He could not provide a convincing mechanism to explain how the continents moved.

His theory completely ignored the existence of fossils and rock formations.

The coastlines of the continents did not actually match up in any meaningful way.

He proposed that the continents were moving at an impossibly fast rate.

That mountain ranges were primarily formed by the planet cooling and shrinking over time.

That the positions of the continents were permanent and unchanging.

That the Earth was only a few thousand years old.

That the ocean floor was a flat, featureless plain.