Answer: D. It makes them seem real and relatable.
Step-by-step explanation:
Everyday people use casual language to communicate as opposed to formal language which is mostly reserved for business settings. In conversations with your friends and family for instance, you most likely use casual language.
In using casual language therefore, Dante and Shay are behaving like normal everyday people which makes them seem more relatable and realistic because it is something that we as real people do as well.