— I'm dead tired. I can't walk any farther, Jenny. 

—  _____ ,Tommy. You can do it! [ ]

A. No problem

B. No hurry

C. Come on

D. That's OK

对长度为n的线性表进行顺序查找，在最坏情况下所需要的比较次数为______。

A．log2n

B．n/2

C．n

D．n+1