Occasionally replacing with is a healthy habit. a) caffeine-free; extra caffeine b) high fat; high sugar c) low-fat dairy; high-fat dairy d) meat; plant-based protein

I think it would be D. Meat; plant-based protein. Both give protein that you need without any added/extra fat or caffeine like the others.

lifetime activities are certain actions that are either required throughout your life or you choose to do them. for example, eating is considered a lifetime activity, drinking water or other beverages, keeping your body clean, taking medicine. those types of actions are considered lifetime activities.