The correct answer is:
d. The theory had sufficient evidence that the continents were aligned, but could not explain HOW the continents moved.
Alfred Wegener proposed the Continental Drift Theory in the early 20th century, and while he provided a compelling case for the alignment of continents based on geological and fossil evidence, he could not adequately explain the mechanism by which the continents drifted. This lack of a clear, actionable mechanism led to skepticism and resistance from the scientific community at the time.