Even though Swift is not suggesting that the rich people in Ireland start eating the babies of the poor, he is still suggesting some realistic solutions. Most of all he is pointing out that the rich need to start doing something to balance out the economy and support the lower classes, instead of treating them like cattle. Comparing them to cattle by suggesting they eat babies points out this flaw of society and that it needs to be changed.
#1 would be the answer because the sentence would not be able to stand alone.
The correct answer is:
C. Assertion, evidence, assumption
Assertion-Evidence, assumption is a type of writting pattern in which a sentence headline states the main message of the writing (Assertion). The Assertion will be later supported with evidence, could be testimony, visually with pictures, or in any way you want to complement your paragraph. After this, you create an "Assumption" based on all the data you obtained.
He probably uses a metaphor because a simile uses the words like and as and a metaphor does not use the words like and as. Hope this helps!