Final answer:
Eisegesis is not a component of the rhetorical situation according to Lloyd Bitzer, while exigence, audience, and constraints are the three main components he identified.
Step-by-step explanation:
The component that is not a part of the rhetorical situation according to Lloyd Bitzer is c) Eisegesis. Bitzer identified three main components of the rhetorical situation: the exigence, which is the issue, problem, or situation that prompts someone to write or speak; the audience, who is the group of individuals the text is aimed at affecting; and the constraints, which include various factors that limit or shape the communication. Eisegesis, which refers to the interpretation of a text by reading one's own ideas into it, is not considered a component of a rhetorical situation.