Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; what are enantiomers?

A) Molecules that have identical chemical formulas but differ in the branching of their carbon skeletons.
B) Molecules that are mirror images of each other.
C) Molecules that differ in the location of their double bonds.
D) Molecules that differ in the arrangement of atoms around their double bonds.