Which Piece of Evidence Does NOT Indicate That a Barrier

Which piece of evidence does NOT indicate that a barrier island has migrated landward?

A) A lighthouse that was built onshore is now well offshore.
B) Oyster shells that grew in the sheltered lagoon behind the barrier island are now found on the front beach.
C) Stumps of trees that grew along the lagoon are now found on the front beach.
D) Barrier island beaches are now more easily eroded than they were one hundred years ago.
E) Fine-grained lagoon sediments are layered beneath the sands of the barrier island.