Companies should understand the risks _______ they are exposed and monitor their control environment

Companies should understand the risks _______ they are exposed and monitor their control environments adequately.
A. on which B. in which C. to which D. with which
【答案】C
【解析】
【分析】
【详解】考查定语从句。句意：公司应该了解他们所面临的风险，并充分监控他们的控制环境。分析句子，此处考查介词+关系代词引导定语从句时，介词的选择。从句中的动词expose译为“使…曝光”，根据句意译为“暴露于”为expose…to，是固定搭配。to 可提至关系代词which前。故选C 项。