Concept:The Muslim city of Qairawān was founded by a well-known Arab military leader during the early Islamic conquests.Explanation:Qairawān is a historic Islamic city in present-day Tunisia.It was established in 670 CE by the Arab commander 'Uqbah b. Nāfi'.The city served as a centre for the spread of Islam and as a base for military campaigns in North Africa.None of the other mentioned leaders founded Qairawān.Answer:'Uqbah b. Nāfi' (Option C).