Concept:Associating partners with Allah is known in Islamic theology as Shirk.Explanation:The term that describes the act of associating partners with Allah is Shirk.This is a major sin in Islam because it compromises the core belief in the oneness of Allah.Among the given options, Riya means showing off, Kufr means disbelief, and Nifiq means hypocrisy.Only Shirk matches the exact meaning of associating partners with Allah.Answer:C. Shirk