Question

4) A you enjoy/your visit to the museum?B: Actually, I not/go​

Answer 1

4. Did you enjoy your visit to the museum?

B: Actually, I didn't go

Answer 2

A: Did you enjoy your visit to the museum? B: Actually, I did not go.

If B did not go to the museum, then they would not have had the opportunity to enjoy the visit. Therefore, B did not have any experience or opinion about the museum visit.