【单选题】

Speaker A: What's the rate for sending a package of books surface mail to JapanSpeaker B: ______
A．Do you have any friends in Japan

B．85 cents per pound, but the limit is 11 pounds per package if you want it to go book rate.
C．I'm afraid it will take about days for these books to reach Japan.
D．The rate for surface mail is cheaper than that for airmail, but surface mail takes longer.