Answer:
B. If you follow the directions, you will certainly pass the examination.
Explanation:
It’s either you did good or she not letting you do it again
B - The fact that Dr. Jekyll 'grew pale to the very lips' and developed 'a blackness around the eyes' suggests turmoil within himself and there is a conflict of character vs. self.
Dr. Jekyll' physical changes in option b indicate he is feeling uneasiness (or turmoil) within himself and is showing it on his face.
Fellow students are the best choice to use informal writing style around.