Concept:The Prophet’s retreat to Cave Hira was the occasion of his first divine encounter with Angel Jibril.Explanation:The Prophet Muhammad used to withdraw to Cave Hira for reflection and worship.At age 40, the Angel Jibril appeared to him there and brought the first revelation from Allah.This marked the beginning of the revelation of the Glorious Qur’an.Answer:B. revelation of the Glorious Qur’an