Concept: The continental drift theory explains how the present continents were once joined together and have since drifted apart.
Step 1: This theory was formally proposed by the German scientist Alfred Wegener in 1912. He suggested that all continents were once part of a single supercontinent called Pangaea, surrounded by a single ocean Panthalassa.
Step 2: Wegener supported his idea with the jigsaw fit of the continents, matching fossils, similar rock structures and palaeoclimatic evidence across now-separated landmasses.
Answer: Option (3) — Alfred Wegener.
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