单项选择题
M: These yellow gloves and those red ones seem about the same as far as quality is concerned. Is there any difference in price
W: The yellow ones arc $3.4.0 a pair, but the red ones are on sale today for $3.15. They were $3.60 a pair last week.
Q: How much will the man pay if he buys two pairs of red gloves（）
A. $6.80.
B. $7.20.
C. $6.30.
D. $3.15.