Until the mid-20th century the largest impediment to trade between area "1" and area "2" on the map was

Until the mid-20th century the largest impediment to trade between area "1" and area "2" on the map was

A) climate.

B) religion.

C) lack of knowledge.

D) lack of tradable goods.

Answer: A) Climate

Explanation: Until the mid-20th century the largest impediment to trade between area "1" and area "2" on the map was climate. The Sahara Desert was a major impediment to trade. True, there were Trans-Saharan trade routes for centuries, but there is no denying that the desert was an inconvenience at the very least.

The answer is climate A