An Editorial Writer for the East Mule Shoe Gazette Wants

An editorial writer for the East Mule Shoe Gazette wants to measure public support for a discontinued construction project that has left a city-block-size hole in the middle of the East Mule Shoe downtown area, so he uses his lunch hour one day to walk down the block adjacent to the project and ask the first 25 people who will talk to him about whether they support continuing the project.
The sample for this survey is:

A) all residents of East Mule Shoe.
B) all newspaper readers.
C) all people downtown the day the survey was conducted.
D) the 25 people who gave the editorial writer their opinion.
E) all American adults.