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
我选的是A, 我理解的是making ignition much easier and （MAKING) flames spreading more quickly. 哪位给分析分析。 谢谢！ | 
