Final answer:
One reason Wegener's hypothesis of continental drift was rejected was that he could not explain what was moving the continents.
Step-by-step explanation:
One reason that Wegener's hypothesis of continental drift was rejected was that he could not explain what was moving the continents. Although Wegener had gathered evidence to support his hypothesis, he did not provide a clear mechanism to explain the movement of solid continents over thousands of miles. This lack of explanation made many scientists skeptical of his idea.