Answer:
Promoting immigration is an attempt for stimulating economic growth and lessen the effect of rising medical and retirement costs.
Explanation:
A is not correct because there hasn't been such a case in any country where there has been the promotion of emigration of the elderly.
B is not correct because such a measure will result in social instability and increased poverty.
C is correct because through immigration, usually inviting people in their 20's and 30's, the labor force increases, so the economy can continue to function and the effects of the aging population to be minimized.
D is not correct because that is exactly the measure that has contributed to the problem of the aging population in the first place.