Answer:
The correct answer is The man is the antagonist because he is opposing Buck.
Step-by-step explanation:
In this excerpt we can see Buck as the protagonist.
The notion of protagonist allows naming the main character of a work of fiction, be it literary, cinematographic or otherwise.
The protagonist, therefore, carries out the most important actions in the story. Without their participation, the plot would be meaningless. The protagonist's opponent is known as an antagonist, and is that character who puts obstacles to the main character's objectives. This role is the one that is fulfilling "the man" in this excerpt.
A work can have several protagonists and antagonists.