Muhammad eventually returned to Mecca as its ruler primarily through the conquest of the city in 630 CE, following a period of conflict and eventual reconciliation. The correct context for this event would be:
The Meccans began to believe in Islam and welcomed him back.
After years of persecution and conflict with the Quraysh tribe in Mecca, Muhammad and his followers established a significant community in Medina. Over time, many tribes and individuals from Mecca began to convert to Islam, and tensions eased. In 630 CE, Muhammad and a large Muslim army marched on Mecca, which led to the city being taken with minimal bloodshed. The leaders of Mecca accepted Muhammad's return, and he ultimately led the city in the worship of Islam.
(Note: The other options you provided contain inaccuracies regarding the events surrounding Muhammad's return to Mecca.)