b. The theory had sufficient evidence that the continents were aligned, but could not explain HOW the continents moved.
Alfred Wegener's Continental Drift Theory proposed that continents were once joined together and have since drifted apart. Although he provided significant evidence supporting the idea of continental alignment and similarities in geological features and fossils across continents, he could not provide a convincing mechanism for how the continents moved, which led to skepticism and lack of acceptance among many geologists at the time.