Concept:Ijma means the unanimous agreement of qualified Muslim scholars on a matter of Islamic law.Explanation:It is accepted as a secondary source of Islamic law after the Qur'an and Sunnah.When scholars agree on a legal ruling, that agreement becomes binding on the Muslim community.This consensus is not based on personal opinion, but on evidence from the primary sources.Therefore, Ijma is best described as the consensus opinion of scholars.Answer:C. Consensus opinion of scholars.