Answer;
-Being obedient to the will of God
Explanation;
The main concept in the Muslim belief system is to be obedient to the will of God. And it is a similar concept with many other religions of the world. The Will of God is above the personal dreams, goals or needs.
The first and most important thing in the life of a Muslim is to respect the Will of God and to be obedient. Obeying is a very important religious virtue. Which allows you to get closer to God and your salvation.
The important natural resource in West Africa that the Songhai Empire controlled was salt.
A.) Salt mines in the sahara desert is the answer.