Which of the following government policies will lead to an increase in the aggregate output of a country in the long run?
(1) to tighten regulation on environmental protection
(2) to grant an amnesty (特赦) to illegal immigrants
(3) to ban the importation of foreign domestic helpers
(4) to build more international schools for attracting expatriates to work in the country
A. (1) and (3) only
B. (1) and (4) only
C. (2) and (3) only
D. (2) and (4) only