Trade became an important part of the economy of the arabian peninsula because:

 Its geography and location! It was a crossroads for Asia, Africa, and Europe. Also, is was surrounded by bodies of water (Mediterranean Sea, Red Sea, Arabian See and Persian Gulf) Sea and land routes connected Arabia to major trade centers. Products and inventions from 3 continents moved along these trade routes by camel caravans. Also, Oases became important for trade because they became stops along the many trade routes.

Explanation:

d and a is the correct anwsers

explanation:

the answer is d. selective incorporation. (apex)