Which words are examples of the same co-reference in the phrase about John F Kennedy?

In the context of co-reference, which refers to two or more expressions in a text that refer to the same person or thing, the selection "John F Kennedy," "president," and "he" accurately illustrates this concept.

"John F Kennedy" is the full name of the individual being referred to. The term "president" represents a role or title that John F Kennedy held, linking it to him without needing to use his name directly. The pronoun "he" further serves as a substitute for "John F Kennedy," maintaining the reference to the same person without repeating his name.

This demonstrates the nature of co-reference, as all three terms are connected and point to the same individual. Understanding this relationship is essential when analyzing texts for clarity and identifying how different expressions relate to the same entity. The other choices mix terms referring to different subjects or roles, which do not establish the same clear co-reference linkage.