Answer:
A is the answer.
Explanation:
If a high school sophomore randomly declares himself a leader to his classmates, he will have difficulty finding people who will listen to him.
This is because - People are less likely to obey people that are just like themselves.
People are more likely to obey someone who represents authority. This cannot be the answer as the kid has not been declared authority by the school or he is not elected by the students. A random kid self electing himself will not be taken seriously by the kids.
So, option A can be the answer.