What factor helped spread Islam?

People were looking for new beliefs.
Merchants carried the faith to new lands.
Rulers required residents to convert.
People found new ideas easier to follow.

All of the factors mentioned helped spread Islam, but one factor that particularly facilitated its spread was the influence of merchants who carried the faith to new lands. Merchants played a crucial role in spreading Islam as they traveled along trade routes, establishing contacts, and spreading religious ideas and beliefs to the communities they encountered. This helped to popularize and expand the reach of Islam beyond the Arabian Peninsula.