What does comparative advantage have the most influence on?

a. capital
b. labor
c. resources
d. specialization

The answer is D: Specialization.

A comparative advantage is the sole focus of those goods for which a country’s resources are most for. It is applied to nations to determine which goods or services they should specialize in producing. David Ricardo, an English economist, was associated a lot with comparative advantage. He considered what goods and services countries should produce. He also suggested that countries should specialize by allocating their limited resources to produce goods and services for which they have a comparative cost advantage.

the rub-al-khali is also known as the arabian desert and the "empty quarter"