Answer:
a. has a comparative advantage in textiles.
Step-by-step explanation:
If the world average price of textiles is higher than the domestic price in Vietnam, it means that Vietnam has a comparative advantage in producing this good, because textiles are cheaper to make in Vietnam than in the average country of the world.
Textiles are cheaper to produce in Vietnam under this scenario either because labor is cheaper, capital is cheaper, or a combination of both. For this reason, Vietnam should produce more textile goods, in other to meet its domestic demand, and to export.