Vending machines, because each is just a word telling you that both were empty. Vending machines is what the whole sentence is based on.
Answer:
Heather tells Melinda that she is too depressing to be around and maybe, if she were able to not be as depressing, they could be friends again. It brings Melinda to the realization that she has no one else & is now alone.
Explanation:
The correct option is III, I AND II.
The first sentence is a quotation, the second sentences is a paraphrase while the third statement is an attribution. A quotation refers to direct importation of the words said by another person, such words are usually placed inside quotation marks.