语法求助

prayforeverUID: 2158111

13. The distinguishing feature of a fluid, in contrast to a solid, is the ease _____ .
   (A) that a deformed fluid
   (B) to deform a fluid
   (C) when a fluid that is deformed
   (D) with which a fluid may be deformed

D
用with 对么？为什么不用by啊
B to deform也说得通吧