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What was the main idea or message taught by the ballad, "king john and the abbot of canterbury"?

Plz change it i can not change this sentences .

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)