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 rhetorical device used on that excerpt is metaphor, as one can see on the use of freedom on one side and chains of poverty on the other side. As well, there is a metaphorical treatment on the case of good words to good deeds.
Answer:
While I was smoking my cigar, a fire engine came roaring around the corner.
Explanation:
In the third option it's showing the time when the fire engine came and that too in correct form of words.
1- Sara won’t read the email if you don’t send it today
2- If you don’t train, you won’t have a chance to win
3- I won’t watch the movie if I don’t have enough time
Hope this helps ( ◠‿◠ )