C protagonist, because a foil is someone who contrasts greatly from the protagonist to highlight some of the protagonists characteristics, and the antagonist is basically a villain. Not many in an audience will sympathize with a villain, so the answer use be the protagonist, or the hero that faces obstacles and eventually overcomes them.
B.
because its at your pace when its most convinient 4 u.
B. Audience is restricted
This is because ceartin people are being censored, or shielded from, ceartin content.
Pretty sure its D
Hope this helped! :)