Answer:
1) Anyone who reads or listens to the message.
Step-by-step explanation:
The term rhetorical situation refers to any situation that involves at least one person using some sort of communication (oral or written) to modify the perspective of another person (the audience). The audience can be intended or unintended recipients of the message.
The correct option is the first one. The second one is incorrect because the listener/reader doesn't need to intend to receive the message. The third is incorrect because the audience does not necessarily consist of students in a particular class (although it can), and the fourth because the audience doesn't need to be gathered in the auditorium.