Which of the Following Is True of the Earth's Coastlines

Multiple Choice

Which of the following is true of the Earth's coastlines?

A) Most of the Earth's coastlines are relatively young and undergoing continuous change.
B) The Earth's coastlines are among the oldest landforms on the planet.
C) There are few inputs that directly affect the Earth's coastlines beyond tidal action.
D) The Earth's coastline show a remarkable degree of similarity across the planet.