Examples of direct speech to reported speech

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)

Which example from a technical document best corresponds with this image

Can someone me with an english language arts assignment? i need someone who's an expert or good at english language ! i need correct answers only !