Answer:
A. Belarus should export linen to Russia
Step-by-step explanation:
A country has comparative advantage in production if it produces at a lower opportunity cost when compared with other countries.
A country has absolute advantage in the production of goods and services when it produces more quantity of goods and services when compared with other countries.
A country should produce goods for which it has comparative advantage in its production because cost of production is lower when compared with other countries.
Russia should stop producing linen because it doesn't have comparative advantage in its production and Belarus should export linen to Russia