Oxygen,silicon and Aluminum Are the Three Most Abundant Chemical Elements

Oxygen,silicon and aluminum are the three most abundant chemical elements within earth's crust.Why,then is aluminum recycled?

A) To reduce the consumption of electrical energy relative to that which is needed to extract aluminum from ore
B) Because aluminum is a precious metal
C) Even though aluminum is abundant in the crust, most of it is within seafloor crust and consequently difficult to obtain
D) All of these reasons are true.