Final Answer:
David asks Stevie to take him to Elmdale for his mother's party because he doesn't have a car and Stevie is his friend who can provide transportation.
Step-by-step explanation:
David doesn't have a car of his own, as he is seen relying on public transportation or others for rides throughout the show.
In this particular instance, David needs to attend his mother's party in Elmdale, but he does not have a means of transportation to get there.
As Stevie is his friend and has access to a car, David asks her to take him to Elmdale.
Throughout the series, David and Stevie share a close friendship, and they often help each other out in different situations.
Stevie is known to have a car and is willing to assist David when he needs transportation. In this case, David relies on Stevie's willingness to help him get to his mother's party.
By asking Stevie for a ride, David is able to ensure that he can attend the event and be there for his mother.
This showcases the supportive and caring nature of their friendship, as Stevie is willing to go out of her way to assist David in attending his mother's important celebration in Elmdale.