What words or expressions in the passage that are local nature

When grendel speaks of unferth and says "i could crush him like a fly" what literary device is being used

This is the noun or pronoun to which a pronoun refers.

Which statement best explains the function of the subtitlein this text? a.it provides additional information that narrows the focusof the text.b.it draws attention to important information in the table ofcontents.c.it introduces the various sections that appear withineach chapter.d.it explains the author's primary reason for writing aboutthis topic.correct (a)