A newspaper wants to determine the level of support in a large town regarding the construction of a new library in a downtown location. Which one of the following would represent a stratified sampling method?
A. Randomly selected four residential blocks in the town and ask everyone who lives on those blocks.
B. Select every fourth person who enters the current library until the desired number of people is selected.
C. Take an SRS of people from the city phone directory.
D. Take a random sample of residents from each of the northwest, northeast, southwest, and southeast quadrants of the city.
E. Number the residents of the town using the latest census data. Use a random number generator to pick the sample.
Answer: D