Question

select the pronoun whose antecedent is audrey and i. although audrey and i were impressed with the performance, we were shocked at the cost of the tickets.

Explanation:

An antecedent is the word or phrase a pronoun refers back to. In the sentence "Although Audrey and I were impressed with the performance, we were shocked at the cost of the tickets", the pronoun "we" refers to the compound subject "Audrey and I" (since "Audrey and I" is a plural subject, "we" is the appropriate pronoun to take its place).

Answer:

we