Answer:
Stanley was a shy person who can be vulnerable.
Explanation:
Although he was the bigger person, he still allowed himself to get bullied and wouldn't resort to violence when he had the capabilities to, and he would complain to the teachers about it instead.
In a good paragraph, all the sentences refer to the main idea of the paragraph. So if the topic sentence refers to the main idea of the paragraph, the remaining should too (false).
I believe it's between A and C. But, I'm going with C!