The answer is B. Ruins because that is the direct object which the direct object is the main thing you are talking about.
The tone you’d most likely use is an engaging/exciting, educational tone if that makes sense. You’d want to use an exciting tone that also has a dramatic tone to it. I’m pretty sure you underline the word “on” in the sentence including “on his return home." Sorry if I’m not correct, I’ve never done this exact question.
Yes it supports the thesis.