If a Country's Political Leaders Wanted to Promote Economic Growth

If a country's political leaders wanted to promote economic growth, which of the following policy alternatives would be most effective?

A) imposition of price controls on agricultural products in an effort to keep food cheap.
B) imposition of high marginal tax rates designed to reduce income inequality.
C) imposition of tariffs and other trade restraints limiting international trade.
D) monetary policy consistent with long-run price stability