which computer do you like best sorry,l can not de

Which computer do you like best
sorry,l can not decide——now
A.to buy which one
B.buy which one
C.which one to buy
D.which l should buy
选项是C.
which one做buy的宾语
再问： 宾语不是应该在动词后吗
再答： which 是连接代词，起连接作用，所以放在不定式的前面。