Based on the idiomatic concept and expression, the adage, "There is no such thing as a free lunch," means "People face tradeoffs."
The adage is a term that is used to describe the proverbial terms or words which express a general truth.
In this case, the adage which is "There is no such thing as a free lunch," can be explained that even when people are getting free things, they are paying for it in another way, they might not be aware of.
This explanation is similar to the phrase "People face tradeoffs." This implies that to get a thing X, we will have to give up or sacrifice other things W, Y, or Z.
In other words, we have to decide to choose one alternative out of the many alternatives available to us.
Hence, in this case, it is concluded that the correct answer is option C. "People face tradeoffs."
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