M: This book with a green cover is $20 and the one with the blue cover is $15 more, and the red one is twice as expensive as this one. ,F: I like the one with the blue cover but I can't afford it right now. Sorry.
(A) M: The red one is the most expensive. (B) M: Excuse me, could you repeat the question? (C) M: The blue one is the most expensive. (D) M: The red one is the most cheap one.
A