B. African cultures are depicted in a biased way.
Past experience because they might have a bad or good relation to that event. For example; if you were involved in many car accidents as a child, getting your drivers license might be terrifying.
I am guessing that the underlined modifier is "quickly" which is why the third sentence is correct.
"quickly" is the positive form.
"more quickly" is the comparative form
"most quickly" is the superlative form