Concept:Tawhīd means the absolute oneness of Allah, so its opposite is any belief that associates partners with Him.Explanation:In Islam, Tawhīd is the core belief in the unity and uniqueness of Allah.The direct opposite of this belief is Shirk, which means polytheism or associating partners with Allah.Shirk includes worshipping other beings or attributing divine qualities to anyone other than Allah.Shukr means gratitude, Qadā and Qadar relate to divine decree and destiny, not to the opposite of Tawhīd.Answer:C. Shirk