Question

Which sentence has a pronoun usage error?
Thomas was supposed to pick me up, but he’s late.
She drove herself to the performance, but left early.
The judges showed their scoresheets to the contestants.
The audience left its seats after curtain call.

Answer 1

Sentence 4. "The audience left its seats after curtain call."

Why: "Audience" is a collective noun referring to individuals, so it takes a plural pronoun in this context. Better: "The audience left their seats after the curtain call."
(Or more explicitly: "Members of the audience left their seats after the curtain call.")