Read the excerpt from part 2 of "Flowers for Algernon." This then is what I was like. I never knew. Even with my gift of intellectual awareness, I never really knew.

This day was good for me. Seeing the past more clearly, I have decided to use my knowledge and skills to work in the field of increasing human intelligence levels. Who is better equipped for this work? Who else has lived in both worlds? These are my people. Let me use my gift to do something for them.

How does Charlie’s seeing the past more clearly advance the plot?

It pushes him to leave the study.
It motivates him to try to become smarter.
It pushes him to try get his old job back.
It motivates him to start his research.