Final answer:
Alfred Wegener developed the theory of continental drift based on the evidence of fitting continents, matching fossils, and similar mountain ranges.
Step-by-step explanation:
Alfred Wegener developed the theory of continental drift based on several lines of evidence. He observed that the continents appeared to fit together like puzzle pieces, suggesting that they were once joined. He also found matching fossils on continents that were separated by oceans, indicating that they were once connected. Additionally, Wegener noticed that there were similar mountain ranges on different continents, further supporting the idea of continental drift.