We need the passage to awnser this.
The correct answer is A. Many of the candidates.
Explanation:
The subject in a sentence is the one who makes the action and it could be a thing, a person, a place or idea. The complete subject makes reference to all the words that modify the noun which is doing or being something. So, the correct answer, in this case, is "Many of the candidates".
When you are trying to identify the verb in a sentence, you are looking for the action. Who did what? In this sentence, the subject is "one of Rodrigo's roommates." What did he do? He "may have forgotten" something. The phrase "to pay the rent" identifies what he "may have forgotten" to do. Thus, the verb phrase in this sentence is "may have forgotten."
