Answer:
I would say the correct answer is B.
Step-by-step explanation:
This is because
A. wouldn't be correct because 60% of your audience is elderly and most of them wouldn't have time to save up that much amount of money in a short period of time.
C. seems correct but B. is a better fit.
D. wouldn't be the correct answer because talking about the future when most people are already higher in their age wouldn't be necessary.
Therefore, B. is the correct answer.