Question

when did people begin to notice that coastlines of continents fit together like puzzle pieces?
when satellites began taking pictures of earth from space
when alfred wegener proposed the idea of continental drift
when early explorers traveled from europe and asia to the americas
when geologists first started examining the fossil record of south america

Explanation:

Early explorers traveling between Europe, Asia and the Americas first noticed the fit - like - puzzle - pieces appearance of continental coastlines. Alfred Wegener later used this as evidence for his continental drift theory. Satellites came much later and fossil record examination is not directly related to first noticing the coastline fit.

Answer:

when early explorers traveled from Europe and Asia to the Americas