@JoelKeenan A is sufficient for B. B is necessary for A. Being a cat is sufficient to be a mammal. Being a mammal is necessary to be a cat. If A is sufficient for B, then B is necessary for A. One implies the other.

@JoelKeenan yes they are. Go back to basic logic sections. If you’re a cat, you’re a mammal. If you’re not a mammal, you’re not a cat. In other words, it is necessary to be a mammal to be a cat.

This explanation is incorrect. Nowhere does the stimulus say or imply that acquiring money sacrifices health. It merely says one should acquire money only if health is not sacrificed by doing so. In other words, it is ok to acquire money if doing so does not sacrifice one’s health.

@AnibalCPerez no flaws here, you are correct. I was about to post the same comment. The heat tolerance language is a total red herring and totally irrelevant to the solution. A is an airtight correct answer.