一次课间，陈老师看到班上一位同学在捡地上的碎纸。他误以为是这位同学乱丢的纸，马上在班上对这位同学进行批评。以下对这件事的认识正确的是[ ]

A．老师有偏见，故意找这位同学的麻烦

B．老师批评学生，学生都应该无条件地接受

C．这是陈老师出于无心而犯的错误，因为老师也是普通人

D．这位同学应该马上同陈老师争辩，否则太委屈了

Getting rid of bad habits is _____ forming a good one. [ ]

A. an effort much as

B. much an effort as

C. as an effort much as

D. as much an effort as