Concept:Ijma' means the unanimous agreement of qualified Islamic scholars on a ruling.Explanation:After the Qur'an and Sunnah, Ijma' is the third primary source of Islamic law.It is derived when mujtahidun (qualified scholars) agree on a religious matter.This consensus gives authority to rulings that are not directly detailed in other sources.Therefore, Ijma' implies the collective agreement of scholars.Answer:B. consensus opinion of scholars.