The commentator’s misuse of language and reliance on inappropriate colloquialisms and jargon are considerable________the audience's comprehension.
A.reflections of
B.impediments to
C.comments on
D.bonuses to
E.catalysts of
解析：
A.reflections of反射
B.impediments to障碍
C.comments on发表意见
D.bonuses to奖金
E.catalysts of催化剂
句子主语中出现了misuse和inappropriate两个负面词汇，因此commentator所做的事情对于观众的理解应该是有负面影响的，五个选项中只有B选项有负面信息，因此答案是B选项。
翻译：评论者误用措辞以及不恰当的使用白话和术语阻碍了听众的理解。
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