What did Muhammad say that every Muslim should to do in his lifetime, if he is able? complete the hajj, a pilgrimage to Mecca
memorize the Quran, or Koran
join a jihad, or holy war
meet a caliph in person

Believing that God had chosen him as his messenger Muhammad began to preach what God had revealed to him. The simple and clear-cut message of Islam, that there is no God but Allah, and that life should be lived in complete submission to the will of Allah, was attractive to many people, and they flocked to hear it.

.

.

All able Muslims must make a pilgrimage (hajj) to Mecca at least once in their lifetimes.

the answer is b. hope this !