The theme of Robert Frost's poem is the destuctive potential of hatred and desire. In his poem, Frost explores with amazingly eloquent brevity two forces which have the potential to bring destruction to the world. The first of these two is desire, which Frost likens in heat and intensity to fire.
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.
Future progressive form is will be
so c.
