Pls help with the questionb on the image pls

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)

How can an author reveal move information about a character

Name two events that gatsby tells nick about that nick finds suspect . what proof does gatsby offer ?