Which excerpt from part 2 of "Flowers for Algernon" most foreshadows Charlie’s deterioration?

A. Most of my writing time is spent on the notes which I keep in a separate folder, but from time to time I feel it necessary to put down my moods....”

B. Dr. Strauss and Dr. Nemur have asked me not to come to the lab any more. I know what they're thinking but I can't accept it.”

C. Dr. Strauss comes around almost every day, but I told him I wouldn't see or speak to anybody.”

D. I am sorry, however, that my own contribution to the field must rest upon the ashes of the work of two men I regard so highly.”