What made many buffalo soldiers more qualified that the average white soldier?

many of them had already served for many years

the were used to the labor

many of them were highly educated

they were able to attend prestigious military institutions

The answer is B.

Explanation: Buffalo Soldier was a term which was used for greater African American regiments in Civil war. These Buffalo soldiers were mainly the slaves who were freed from confederate areas. They were used to do hard labor from their early life. So during the war it gave them an extra advantage for fighting in the difficult condition on the war more than the average white soldiers. So many Buffalo soldiers were more qualified than the average white soldiers.

C. Geologic processes we see today were also at work in the past