Most of students like to play sports during their holidays. But they exercise in different ways. We did a survey of 100 students  in Liu Chang's class, The picture on the right shows the result, The number of students playing badminton is the largest. Then,     students like playing badminton.

A. 29

B. 27

C. 28

最近，一则“中国人一年吃掉200多万吨地沟油”的新闻，让多次曝光的“地沟油”问题再次浮出水面，引起广泛关注。国务院要求开展“地沟油”专项整治活动，严厉打击非法生产销售“地沟油”行为。卫生部于2010年7月21日发布公告，就食品中毒等进行预警，这是《食品安全法》颁布以来发布的首个食品安全预警公告。事实证明，没有良好的市场秩序，就难以保证我国社会主义市场经济的健康发展。

结合《经济生活》的有关知识，说明怎样用法律和道德来规范市场秩序？

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