Why did the green light change its significance?

Ifound this on google “preview — long walk to freedom by nelson mandela. “i am fundamentally an optimist. whether that comes from nature or nurture, i cannot say. part of being optimistic is keeping one's head pointed toward the sun, one's feet moving forward.” i hope this you for what your looking for.

Alferdo is the subject

The answer is c, because it's referring to you, and then refers to a group of people stopping the flu, which is a clever way of making the viewer feel like they have the impact to stop a disease. (sorry its hard to explain)