Derland Is a Modern Economy with a Highly Educated Labor

Derland is a modern economy with a highly educated labor force and an average wage of $50,000 per year. Samland is a poor country where the labor force has an average education level of 5 years of schooling and an average wage of $600 per year. Which trade policy would be likely to have the most long-run impact in raising wages in Samland?

A) free trade
B) Derland imposing import quotas on foreign-produced products
C) Derland imposing tariffs on imported necessities
D) Samland creating new regulations to increase environmental protection