Correct Answer:
C. Which I visited
Correct answer: Which I visited. In a non-defining clause (set off by commas), “which” is used for things.
Background: A non-defining clause gives extra information about a noun.
- That I visited: “That” is not used in non-defining clauses.
- Where I visited: “Where I visited” is not grammatically correct here.
- Who I visited: “Who” is used for people, not places.
Did you know? “That” is only used in defining (restrictive) clauses.
Memory trick: Commas → which.