prep162 请问我的理解是对的吗？

The government predicts that, for consumers and businesses that make a large number of long-distance calls, the Federal Communications Commission's recent telephone rate cuts will greatly reduce costs, though some consumer groups disagree with the government's estimates, suggesting they are too optimistic.

(A) The government predicts that, for consumers and businesses that make a large number of long-distance calls, the Federal Communications Commission's recent telephone rate cuts will greatly reduce costs
(B) The government predicts that costs will be greatly reduced for consumers and businesses that make a large number of long-distance calls by the Federal Communications Commission's recent telephone rate cuts
(C) The government's prediction is, for consumers and businesses making a large number of long-distance calls, costs will be greatly reduced by the recent telephone rate cuts made by the Federal Communications Commission
(D) For consumers and businesses that make a large number of long-distance calls, the government's prediction that the Federal Communications Commission's recent telephone rate cuts will greatly reduce costs
(E) For consumers and businesses making a large number of long-distance calls, the government predicts that the recent telephone rate cuts that the Federal Communications Commission has made will greatly reduce costs

答案是A我选了B，后来又仔细看了看觉得A是说for有表原因的意思，因为顾客们和商人们打好多长途电话，才致成本下降
B是降低成本是为了顾客们和商人们打好多长途电话此处 for是表目的？？