Explain why people who have led sedentary
lives tend to "shrink” as they age.

there bones start to weaker causing them to arch, making then look smaller or look like they have "shrunk" .

Explanation:a.“The purpose of health education is to…”  (Hint: see what practicing health educators wrote)

Make sure people have the right health and can be heaslthy.

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out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.