Answer:
B) effective because President Wilson outlines the emotional reasons for entering the war.
Step-by-step explanation:
This section rotates around feelings and how everybody on this planet is the equivalent humanity. "But why did we win? Because others helped us; because of others related to us and wanted us to have the freedom we possess now. So what reason do we have to not repay the ones who helped us when we needed it the most?"
Basically, Wilson is reminding everybody that we are all the equal, regardless of where we live or what we will be we are the equivalent. What's more, that implies that we battle with one another, for one another.