Why were the Nile cataracts a problem for Kush?

(1 point)
Responses

Their trading boats were unable to go past them.

Their trading boats were unable to go past them. - no response given

Many sailors died on them.

Many sailors died on them. - no response given

They cut Kush off from trading.

They cut Kush off from trading. - incorrect

The Egyptians used them as a defense against Kush's armies.

1 answer

The Egyptians used them as a defense against Kush's armies. - correct