The third alternative is correct (C).
Students study to obtain knowledge about the laws of human nature, its complexities, mathematics, languages and natural sciences, such as biology, physics and chemistry.
In this context, the college is the place of learning for a lifetime. The best place to discuss the problem of high sugar consumption and its damages is the college, which has a specialized and respected body by the students. In this way, explaining in a lecture about the problems that sugar causes in the human body in the long run is a correct way to encourage students to eat less sweets.