Read the excerpt from part 2 of "Flowers for Algernon." Dr. Nemur appears to be uncomfortable around me. Sometimes when I try to talk to him, he just looks at me strangely and turns away. I was angry at first when Dr. Strauss told me I was giving Dr. Nemur an inferiority complex. I thought he was mocking me and I’m oversensitive at being made fun of.

What does this excerpt tell the reader about Charlie?

A) He is relieved that the doctors understand him.
B) He takes pleasure in mocking others.
C) He is concerned about how he appears to others.
D) He is worried about losing his intelligence.