Many Rocky Coasts Occur Along Active Margins;why Is This

Many rocky coasts occur along active margins;why is this?

A) Active margins are associated with larger storms,which causes more erosion of sediment,leading to fewer beaches.
B) Active margins are associated with volcanic activity,and volcanic rocks are very hard to erode;thus,there is not enough sediment produced.
C) Active margins often experience repeated uplift,and thus the waves have not had sufficient time to erode the land surface down to sea level.
D) Active margins tend to have far fewer streams that feed sediment to the oceans;thus,there is not enough sand to create beaches.

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