Nubians did not use the nile for trade because .
a.
of the cataracts
c.
they were not a mercantile society
b.
they didn’t live near the nile
d.
they didn’t know how to make boats

A, because of the cataracts.

Explanation:

The cataracts made the river too dangerous to travel in as the rock filled rapids would destroy the boat, and destroy them.

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the answer is true sir