Read the conversation and answer the question.
Ali: Hey, Emre! Do you want to go to the cinema with me on Saturday afternoon?
Emre: I always attend my guitar course on Saturdays. How about Sunday?
Ali: I usually visit my grandparents on Sundays. Maybe next week?
Emre: Sure, that sounds good.
According to the conversation, why does Emre refuse the invitation?
A)He has a guitar course on Saturdays.
B)He visits his grandparents on Sundays.
C)He doesn't like going to the cinema.
D)He is busy every weekend.