The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
Sundiata Keita was a great lord that eventually became the most important emperor of Ghana. Indeed, he was the founder of the Mali Empire in Ghana. He was the ruler from 1235 to 1255 BC. Most of what is known of Sundiata was passed through the oral tradition because as in the case of the Inca Empire in South America, in the ancient Mali empire there were no written records of their history.
What gave the Kingdom of Ghana a military advantage over its neighbors?
There were basically two things that represented a major advantage for the Ghana Empire in its time: the first one is horses. They ride horses and this helped transportation of people and goods, and a major advantage on the battle field. The second advantage was iron. Through iron, they could fabricate powerful weapons that wounded their enemies and made them won the war and conquer new lands.