请问老师C选项是什么意思？
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2017100901000008问题如下 Unr contions of perfecompetition, a company will breeven when market priis equto the minmum point of the: A.average totcost curve B.average variable cost curve C.short-run margincost curveA is correct. A company is saito breeven if its totrevenue is equto its totcost. Unr contions of perfecompetition, a company will breeven when market priis equto the minimum point of the average totcost curve.考点盈亏平衡点解析在完全竞争市场上，如果厂商的收入（市场价格）等于其平均总成本，那么这就是厂商的盈亏平衡点。请问是不是跟完全竞争市场没关系？
NO.PZ2017100901000008 问题如下 Unr contions of perfecompetition, a company will breeven when market priis equto the minmum point of the: A.average totcost curve B.average variable cost curve C.short-run margincost curve A is correct. A company is saito breeven if its totrevenue is equto its totcost. Unr contions of perfecompetition, a company will breeven when market priis equto the minimum point of the average totcost curve.考点盈亏平衡点解析在完全竞争市场上，如果厂商的收入（市场价格）等于其平均总成本，那么这就是厂商的盈亏平衡点。 请问老师，这道题的考点我没在基础讲义里面看见呢?
这道题目考核哪个知识点呢？完全竞争市场里面，短期不是只有P小于单位变动成本才关闭吗
