Answer:
Guest taken the before arrived
A. The sentence works fine. one could argue B, but a colon is used to separate a run-on or show two complete thoughts in the same sentence, so arguably B would not work either.
Answer:
C
Explanation:
This argument makes you think about the welfare and future of the student, and schools are supposed to prepare you for the future. With this reasoning, there aren't too many counter-arguments to this.