A.
Before we make a plan, we should weigh the benefits of it against the risk of it.
这道题的关键是理解不同介词的意思.因为benefits（收益）和risk（风险）是两个相反的概念,所以用against最合适.
翻译成中文是：
在我们做计划之前,我们要权衡这计划的收益及相对的风险.
注意后面的代词it是指状语从句中的a plan.
before we make a plan,we should_the benefits of it_the risk
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