oldprep-cr2-39

cdwayne

premise:
Those small domestic mills will take more business from the big American steel mills than would have been taken by the foreign steel mills in the absence of quotas.

conclusion:
The imposition of quotas limiting imported steel will not help the big American steel mills. In fact, the quotas will help "mini-mills" flourish in the United States.

The argument implies that the reason why mini mills stand to benefit is because mini mills take more business from the big mills. In order to weaken this, (E) shows an alternative cause to provide another reason.
HTH