Bucket \(A\) is 1/4 full of sand, and Bucket \(B,\) which has one-half the capacity of Bucket \(A,\) is 3/8 full of sand

[Vincen]

Bucket \(A\) is 1/4 full of sand, and Bucket \(B,\) which has one-half the capacity of Bucket \(A,\) is 3/8 full of sand. Jana pours the contents of Bucket \(B\) into Bucket \(A.\) Bucket \(A\) is now filled to what fraction of its capacity?

A. 3/8
B. 7/16
C. 1/2
D. 5/8
E. 7/8

[spoiler]OA=B[/spoiler]

Source: Princeton Review