[求助]问一下prep 2-79 (好像没有人问过)

79.   (28717-!-item-!-188;#058&004013)

Unlike battery-powered electric cars, automakers say that cars with fuel cells, which supply them with electricity, can provide driving range and performance similar to the internal combustion engine.

(A) Unlike battery-powered electric cars, automakers say that cars with fuel cells, which supply them with electricity, can provide driving range and performance similar to

(B) Unlike battery-powered electric cars, automakers say that cars with electricity supplied by fuel cells can exhibit driving range and performance similar to those provided by

(C) Unlike battery-powered electric cars, fuel cells that supply cars with electricity can provide driving range and performance that automakers say is similar to

(D) Automakers say that unlike battery-powered electric cars, fuel cells that supply cars with electricity can provide driving range and performance similar to

(E) Automakers say that unlike battery-powered electric cars, cars with electricity supplied by fuel cells can exhibit driving range and performance similar to those provided by

答案是E，我当时在B和E中间纠结了半天，选了B，为什么"Automakers say that"必须要放在句首呢？