Answer: It is the ninth inning and we are down by three runs.
The nurse is the comic relief in the play of Romeo and Juliet
Lieutenant is not a part of the main clause, and it is an address to a person that is inserted into the sentence. It must be therefore separated by comas on both sides: the correct answer is a.
MLA in-text citation style uses the author's last name and the page number. If the source doesn't include a page number then only use the last name of the author.