Read this excerpt from The Miracle Worker Act 3.

KELLER: Miss—Annie.

(He has an envelope in his fingers.)

I’ve been waiting to give you this.

ANNIE [AFTER A BREATH]: What?

KELLER: Your first month’s salary.

(He puts it in her hand.)

With many more to come, I trust. It doesn’t express what we feel, it doesn’t pay our debt. For what you’ve done.

Based on the dialogue, which statement best describes Keller?

He is pessimistic.
He is generous.
He is wealthy.
He is grateful.