Which statement best explains why the cultures of Egypt and Kush were similar in many ways? A.
Both peoples stayed in the regions they had settled for centuries.
B.
The two kingdoms had close trade relations for centuries.
C.
Both peoples had originally migrated from the same region.
D.
The two kingdoms both were originally controlled by Assyria.

The two kingdoms had close trade relations for centuries.

Explanation:

The kingdoms of Egypt and Kush, even before becoming part of a single kingdom, were very similar to each other. For starters, they were bordering each other, with Egypt being located in the lower part of the Nile, while Kush being located in the central part of the Nile. Because they were bordering and had societies that revolved around the same resources, they had similarities even from the beginnings of these civilizations.

Over time, these two kingdoms developed very close ties. The trade between the two was immense, and people from both kingdoms were regularly traveling between the two. This brought in exchange of cultural traits, ideas, and technology, and gradually the two kingdoms were becoming more and more similar to each other, so even when the time came when they entered a conflict and Kush fell under Egyptian rule, there wasn't any particular problem for the population as almost everything remained the same.

brave new world, aldous huxley (1932)