Here's my answer he used many different internal tragedies in all the passages because he wanted to tell you about his life and how hard it was while he was a slave. I hope this helps.
Answer:
Third sentence
Explanation:
In the first sentence, therefore is used for reasoning
ex: Therefore, dirty water is bad for the environment because it can make people sick
The second sentence is a run on sentence so it would not be correct.
it would be c and d, both are trying to convince people
