Choose the sentence that has a subject complement.

A. We can't leave without seeing her.

B. I felt much better.

C. The nurse felt my pulse.

D. The day ended with many surprises.

A subject complement is the adjective, noun, or pronoun that follows a linking verb. The following verbs are true linking verbs: any form of the verb be [am, is, are, was, were, has been, are being, might have been, etc.], become, and seem. In the question, the sentence 'I felt much better' can be re-written as 'I am much better'. Thus option B is the correct answer.