D - It intensities the conflict.
Any time there is a complication in a story, the pupose is to intensify the conflict. Exposition delivers necessary information (example: the setting), and a conflict does not resolve (end) a story nor introduce a theme.
The answer is A
(don't mind this part)
Soporific is an English word which means - cause to sleep. The origin of this word is Latin. It comes from the Latin word sopor - deep sleep.