Concept:The death of Khadijah marks a significant event in early Islamic history.Explanation:Khadijah, the wife of the Prophet Muhammad, passed away in the year 619 C.E.This year is remembered as the 'Year of Sorrow' because the Prophet also lost his uncle and protector, Abu Talib, in the same period.The loss of Khadijah was a great personal grief to the Prophet.Among the given options, 619 C.E. correctly matches this historical event.Answer:A. 619 C.E.