The answer is 'colluded', because it means that they schemed to do it secretly. The other options aren't possible here, and most of them are adjectives, and you need a verb.
Answer:
its the one you marked
helps us learn a topic by explaining it in order
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! :)