语法求教 急111

In spite of continuing national trends toward increased consumption of specialty foods, agronomists in the Midwest foresee a gradual reversion to the raising of agricultural staples: feed corn and hard red wheat.

(A) a gradual reversion to the raising of agricultural staples

(B) that a gradual reversion back will feature the raising of agricultural staples

(C) a gradual reversion back to the raising of agricultural staples again

(D) a gradual reversion to raise agricultural staples（A）

(E) a gradual reversion into the raising of agricultural staples

请问为什么不选择d呢？