The answer is letter A, his ability to understand his enemy.
Explanation:
"Sitting Bull" was an important figure for the<em> Sioux warriors.</em> He was a very courageous leader who also had the wisdom, especially when it comes to fighting the white settlers. He became very famous when he was able to wipe out at least 700 men under <em>Lieutenant George Armstrong Custer</em> in the "Battle of the Bighorn." The US army were outnumbered by Sitting Bull's forces.<u> This was because he had the ability to understand his enemy.</u> <u>He had some encounters with the Americans, </u>thus <em>it allowed him to know their strategies at war. </em>
The defeat of the US army angered the US government. Thus, the Native Americans were called "bloodthirsty."