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.
their natural growth rate, cutting their feed allotment
their natural growth rate, their feed allotment cut
growing them naturally, cutting their feed allotment
they grow naturally, cutting their feed allotment
they grow naturally, with their feed allotment cut
1. grow rate can't be faster
2. growing them naturally makes no sense
PROBABLY: as fast as [they grow naturally], [..] is just a part of comparison, not a subordinate clause, so the "cutting their ..." won't modify [they grow]. That's why D is logically right on comma+ving?
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