Read the dialogue and answer the question.
Efe: Hello, is this Mr. Kaya's office?
Secretary: Yes, it is. Who's calling, please?
Efe: This is Efe from the science club. I'm calling about the field trip.
Secretary: I see. Mr. Kaya is not available at the moment. Would you like to leave a message?
Efe: Yes, please. Could you tell him that the bus will leave at 8 a.m. on Saturday, not 9 a.m.?
Secretary: Sure. I'll let him know.
What change does Efe want to tell Mr. Kaya about?
A)The bus will leave one hour later than planned.
B)The bus will leave one hour earlier than planned.
C)The field trip will start at a different place.
D)The science club meeting will be on Sunday.