When are a pair of single quotation marks (‘example’) needed?

Which part of the original work should the adaptation retain

Martin luther king jr often spoke of a day in the future when he hoped that his children would be judged not by their skin color but instead by their character. write a narrative essay about a moment in your life when you were judged by something other than the content of your character. use narrative techniques to develop experiencies, events, and characters

One way to show a character is a) to use dialogue b) use dynamic sentences c) interview friends d) share details