A. Sentence 2
(2) As a college teacher who has also taught seventh-grade science, I have some experience with the faces and attitudes of adolescence.
A fact is something – news, information, a talk, a seminar, etc., that is telling the truth and objective. This could be referenced by the people listening to it. An opinion is a declaration of the person’s thoughts and suggestions that is possibly subjective in nature. This cannot be referenced since it is declared by basing of emotions or one’s own perception on the information.