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Mansa Musa was a power ruler of Mali because...
Mansa Musa was a power ruler of Mali but...
Mansa Musa was a power ruler of Mali so...

Mansa Musa is one of the most powerful rulers of the world ever.

Explanation:

Mansa Musa was a power ruler of Mali because he is the first major ruler of the region above Sahara near to the western African region.

Mansa Musa was a power ruler of Mali but he was not from Mali. HE had been a man of the Western African region only but he came to found the empire that was based around Mali.

Mansa Musa was a power ruler of Mali so he had built an empire around Mali and his riches and prosperity had made this empire reach pout to the world far and wide.

answer; i believe the correct answer is (crops);