Which joiner shows a choice between coordinate ideas? hence
either . . . or
still
both . . . and

i believe it’s the first one, but it could be the second! not the third or fourth.

explanation:

a. to introduce the audience to important characters .

b. to inform the audience where the story takes place .

e. to lay out specific details about different plot points.

i’m confused as to what your asking ?

im not sure what it is