It would be "<span>I was present at the sessions of the great Congress in the month of December." He is using that sentence to give credibility to what follows.</span>
answer what maybe i can help
It is important because the sources tell you whether the article was credible. When you have an article that has bad source, you are running the risk of having, wrong, opinionated data. This can discredit you paper if you use it.
"Her name is Marcia"?
Unless it is apart of the quotation, always put punctuation outside
I can conclude it would be answer b