英文经济题

which case is market failure occurring? 市场失败会发生在哪种情况呢？ a.Consumers determining what is produced 决定了应该要生产什么的消费者身上 b.Firms producing above the lowest possible cost 生产了超过了可能的最低成本之上的公司 c.Price falling as a result of a decrese in demand 作为一个需求坚守结果