Hello there!
The most plausible answer here is B) When I was very young, I visited my friend at the hospital when she broke her arm. This experience changed my life. Meeting the people at the hospital and seeing how they cared for my friend made me see that I want to be a doctor so that I can help people, too. This introduction provides a steady, and fine window into further details, giving the overall subject of what the story will be about. Hope I helped you, have a nice day!
Every paragraph should have (1)a topic sentence, (3)unity, and (4) coherence.
