Final answer:
The part of the essay that indicates the target reader as a college student in a freshman composition class is mentioned multiple times, specifically referring to a college course typically taken by freshmen.
Step-by-step explanation:
The part of the essay that most clearly indicates the target reader as a college student in a freshman composition class is when it mentions 'this essay for a first-year composition class' and 'first-year composition class' multiple times. These phrases specifically refer to a college course that is typically taken by freshmen, indicating that the target reader is a college student in a freshman composition class.