Islam's two sects... the Sunnis and the Shi'as... have a major conflict over the following... ?

C. Disagreement over who should lead the Muslims after the death of Muhammad.

Explanation:

Islam can be defined as one of the most popular religions practiced across the globe and it is typically dependent (based) on the holy Quaran and the teachings of Prophet Muhammad.

Islam's two sects, the Sunnis and the Shi'as have a major conflict over who should lead the Muslims after the death of Muhammad.

This ultimately implies that, these two (2) sects (the Sunnis and the Shi'as) are divided or not in harmony with each other based on the fact that, they are in disagreement over who should lead the Muslims as the leader of Islam after the death of Prophet Muhammad.

Some of the countries where Shi'as are found includes Iraq, Azerbaijan, Iran, Bahrain while the Sunnis are found in countries like Indonesia, Morocco etc.

a, c, & d are correct:

they wanted lands to settle the extra population.

they wanted new markets for english goods.

they wanted to avoid civil war.