I think the answer is d not a 100 % sure
The answer is “During the reign of Askia Muhammad, the Songhai
empire reached its greatest size.”
<span>Askia is also known as Muhammad Ture. He was able to extend
the territory of the Songhai Empire. He was able to get alliances, thus allowed
him to easily conquer many kingdoms. One of the achievements of the Songhai
empire, he was able to gain the respect of his people.</span>
The answer would be -> b. incorrect
Schist has the highest metamorphic grade.
