The Age of Oceanic Crust in the Pacific Is Asymmetric

The age of oceanic crust in the Pacific is asymmetric because

A) much of the crust in the eastern Pacific has been subducted.
B) spreading is faster on the east side of the ridge than on the west side.
C) the eastern Pacific collided with the Americas to form mountain ranges.
D) volcanism on the west side of the ridge has made the crust larger.
E) all of these.