Which of the following is a synonym for "Anstrengung"?

The term "Anstrengung" in German translates to "effort" in English, which conveys the idea of exertion or striving to achieve a goal. The correct choice, "Mühe," directly aligns with this meaning, as it also refers to effort or hardship invested in a task. Both words share a common theme of struggle and exertion, making "Mühe" an apt synonym for "Anstrengung."

In contrast, the other options do not convey the same sense of effort. "Herausforderung" translates to "challenge," which may imply a situation that requires effort but does not inherently mean the same as putting in effort. "Komfort," meaning "comfort," refers to ease and lack of effort, and "Vorsicht," which means "caution," explores the notion of carefulness rather than effort. Therefore, it's clear why "Mühe" is the best synonym for "Anstrengung."