9. (5%) Following Question 8, now suppose that the government introduces a policy: imposing a lump-sum tax (T.) onagents who are in their first period of life but giving a lump-sum transfer (Ta) to agents who are in their secondperiod of life. Which of the following statement is correct?
(A) If T1=T2, there is no effect on the representative agent's optimal decisions.
(B) if T1＞T2(1+r),cs increases.
(C) If the interest rate is zero, the life-time budget constraint is unchanged.
(D) If T1＜T2/(1+r), the representative agent benefits from the policy.