Answer:
The correct answer is letter "A": followers, leaders, and situations.
Explanation:
Leadership is the act by individuals portrait the achievement of goals by eliciting followers to contribute voluntarily in the process regardless of the situation the team as a whole is facing. Leaders reach this by sharing their decision-making, showing commitment to the team's purpose and planning.
So, leadership should be studied in a place where leaders join followers according to the situation they want to face together.