Concept:The central message of Prophet Muhammad’s (SAW) early mission in Makkah was the call to pure monotheism.Explanation:The Prophet’s da’awah in Makkah focused on inviting people to worship Allah alone, rejecting all forms of idolatry and polytheism.This message is known as Tawhid, the unity of Allah.It was the foundation of his preaching before other legal and social teachings were fully established.Answer:A. the unity of Allah