I would choose the last choice, D. Adverbial.
Adverbial phrases include two or more words that serve as adverbs. So "in an hour or two" can be classified as an adverb phrase.
The answer is is A. The narrator wanted Fortunato to thinks
that he is concerned for his health.
The narrator wanted to kill Fortunato by covering it up with
a lie. The narrator wanted to lure Forunato so that he can easily kill him.
You would most likely find strict rules in a working area.
Tell me if you want an explanation.
PM me if you have more questions and I would be happy to answer.