Wegener observed evidence of the similarity between the type and age of rocks at the edges of continents. Which of the following best describes the reason for continents to have the same types and ages of rocks on their edges?

Glaciers created the edges of the continents as they moved rocks from one continent to another.
Ocean waves weathered the edges of the continents so they appeared to look like giant puzzle pieces.
Wind erosion carries pieces of rock away from the continents exposing similar rock types.
The continents were part of an ancient, single landmass called Pangea that moved apart over millions of years.