What helped medieval islam make major advances

What helped Islam spread so quickly? I guess it kinda like your question

Explanation:

Muslim conquests following Muhammad's death led to the creation of the caliphates, occupying a vast geographical area; conversion to Islam was boosted by missionary activities, particularly those of imams, who intermingled with local populations to propagate the religious teachings. And I think that is how it spreads if any of that makes any sense!

d. the right to establish a one-house legislature

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.