– Your schoolbag is very nice.-- .A. SorryB. OKC. Thank you.D. No it is.

问题补充：

– Your schoolbag is very nice.

-- .

A. Sorry

B. OK

C. Thank you.

D. No, it is.

答案：

A. Sorry

B. OK

(答案→)C. Thank you.

D. No, it is.

解析：当别人对你的物品表示夸赞，我们出于礼貌应该表示感谢说thank you，故本题选C。