单项选择题:
An analyst does research about market supply curve. Which of the following statements is most accurate（）
A. The market supply curve is a total cost curve.
B. The market supply curve is the horizontal sum of the individual producer's supply curves above average variable cost curve.
C. The market supply curve is formed by adding the producer surplus of all individual producers.
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答案：B
解析: 市场供给曲线是将单个企业的供给曲线超过平均可变成本线累加而得到的，因为当价格低于平均可变成本线时，企业会停止经营。