题目内容

铜矿采掘业发言人提出建议：为了维持国产铜的价格，必须限制较便宜的国外铜的进口，否则，我国的铜矿采掘业将难以经营。电线电缆制造业发言人对上述建议的反应：我国电线电缆制造业购买的铜70%都是国产的。如果铜价不是按国际价格支付，那么，由于成本的提高，国产的电线电缆就会卖不出去，这样对国产铜的需求就会下跌。以下哪项，是对电线电缆制造业发言人的论证的最恰当评价？

A. 该论证无的放矢，和铜矿采掘业发言人的建议无关。
B. 该论证是循环论证，它预先假设了为了评论铜矿采掘发言人的建议而需要证明的东西。
C. 它说明铜矿采掘业发言人的建议如果实施的话将会对其自身产生负面影响。
D. 它没有给出理由说明为什么上述建议的实施并不能减轻铜矿采掘业难以经营的担心。

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