很弱地问PREP SC1-1

1.   To meet the rapidly rising market demand for fish and seafood, suppliers are growing fish twice as fast as their natural growth rate, cutting their feed allotment by nearly half and raising them on special diets.

(A) their natural growth rate, cutting their feed allotment

(B) their natural growth rate, their feed allotment cut

(C) growing them naturally, cutting their feed allotment

(D) they grow naturally, cutting their feed allotment

(E) they grow naturally, with their feed allotment cut

个人感觉比较的对象就是人工养殖的rate和鱼自然繁殖的rate，为什么不选A呢？

为了和前面的suppliers are growing fish 动作对应