Concept:Umar’s conversion was influenced by a personal encounter connected to his family’s faith.Explanation:Umar initially set out to oppose Islam and harm the Prophet.He was informed that his sister and her husband had already accepted Islam.When he went to their house, he heard and read the Qur’an, which touched his heart.His sister’s earlier acceptance of Islam opened the way for his change of heart.Answer:B. His sister's earlier acceptance of Islam