1. A fire in an enclosed space burns with the aid of reflected radiation that preheats the fuel, making ignition much easier and flames spreading more quickly.

(A) flames spreading

(B) flame spreads

(C) flames are caused to spread

(D) causing flames to spread（D）

(E) causing spreading of the flames

根据平行应该选e亚，ignition是名词，spreading of the flames不也是名词词组吗

望牛牛们指点

spread本身也可以做名词，spreading在金山词霸里是动词，意思是“撒布”，不知是不是这个原因