Use the diagram of the molecular structure of lactic acid to answer the question.
Which functional groups are represented in this molecular structure?
A) a methyl group, a hydroxyl group, and a carboxyl group
B) a sulfhydryl aroup. an amino group, and a carboxvl group
C) a methyl group, an amino group, and a carboxyl group
D) a sulfhydryl aroup, a hydroxvl group, and a carboxvl group
