In grammar, an interjection is a word used to display emotions, such as surprise, glee, anger, etc. In this case the word "Yummy" is being used to display eagerness to enjoy the dinner that smells so unbelievably good.
Option A, "Yummy", is your correct answer choice.
Hope that helped! =)
A. Narrator outside the action of a story.
The correct answer is B, poetry, puns, and wordplay often rely on the way words sound or look and not just on the meaning of the words. That is why it is difficult to retain the same amount of wit and humor while translating.