The correct answer is A. Supervise.
Supervise means to watch over and direct the work of others. It is often used in a professional setting, such as when a manager supervises their employees.
Glance means to look quickly at something. It is often used in a casual setting, such as when you glance at your phone to see who is calling.
Contest means to compete against someone or something. It is often used in a sporting or academic setting, such as when you contest a decision in a game or an exam.
Look means to direct one’s gaze towards something. It is a very general word that can be used in many different contexts.
In the context of the question, the word “oversee” means to watch over and direct the work of others. This is most closely matched by the word “supervise”.