What part of speech does the word in capital letters play in this sentence?

silver will tarnish if it is not polished often

*interjection
*pronoun
*conjunction
*adverb

Which is one of the reasons that swift gives for his proposal? a.) the threat of harvesting babies would engourage stronger discipline among the young b.) thereis a famine inthe land, nd the children are plentiful c.) the meat of the irish infandts goes well with many dofferent vegetables d.) children would become valuable property