I agree with the person above - the complete subject of this sentence is D. a group of men.
In this excerpt Marcus faces the conflict that his father doesn't agree with him. This type of conflict is called "Man vs. Man" It is the most common type of conflict in a piece of literature, it is also known as interpersonal conflict. In a man vs. man conflict, the protagonist, Marcus, feels something different than another character or the antagonist. This is the type of conflict that Marcus faces.
Hope this helps! :)
Complex and compound sentences.
Although he is not popular, his reputation is great.
I love to go shopping however I’m on a budget.
