Why is it appropriate to place seafloor spreading in post-drift studies?

Correct answer: Because it gives a post-Wegener understanding based on ocean-floor movement

Direct answer: Option A. Seafloor spreading belongs to post-drift studies because it provided later evidence and a mechanism for moving oceanic crust after Wegener’s continental-drift proposal. The reasoning is chronological: Wegener proposed that continents had moved, but his original explanation did not fully identify a convincing driving mechanism. Later studies of the ocean floor found mid-ocean ridges, new crust forming, and movement away from ridges. This helped develop the modern understanding of plate tectonics. Option A correctly refers to a post-Wegener understanding based on ocean-floor movement. Option B is wrong because seafloor spreading was not fully developed before Wegener. Option C is wrong because the topic is physical geography and geology, not agriculture. Option D is wrong because it is not a language theory; it explains geological movement. Memory cue: drift was the earlier idea; seafloor spreading was later evidence and explanation.