They is referring to the reader
The correct answer is "Those boys"
Other options would give grammatically incorrect sentences according to the standardized English language versions.
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The answer is number 4.The stanzas combine to convey that love is complicated.There is glory and there is pain.There is pleasure and there are wounds. The persona in the poem seems to have had some experience in love affairs and these stanzas are full of expressions that contradict each other .That is why I think the author is trying to convey how intricate love could be.