The Standard Width of a New Piston Ring Is 0

Multiple Choice

The standard width of a new piston ring is 0.1671 in. If a used ring measures 0.1622 in., how much has it worn?

A) 0.0004 in.
B) 0.0049 in.
C) 0.0122 in.
D) 0.0038 in.
E) 0.017 in.