B. He is trying to convince Xavier to sell the farm.
Explanation:
In the given excerpt, Xavier expresses his concerns to Kenneth about the fact his grandma left him a farm. Unlike her, who wanted to be a farmer, he doesn't. His life goals are completely different and inheriting a farm only prevents him from easily fulfilling them. Kenneth understands this and offers a solution - to sell the farm. By selling it, Xavier would no longer be bound to it and could even use the money to go to college. This would solve his problem.
The answer to your question would be D. To restate the thesis and summarize the final point. Hope this helps and just ask if you need anything else! :)