June Used a Multistage Sampling to Conduct a Survey of Current

Multiple Choice

June used a multistage sampling to conduct a survey of current political attitudes in a major metropolitan city. First the city was broken into neighborhoods, and then some participants were selected out of each neighborhood to be included in the sample. In this example, when was random sampling employed?

A) when neighborhoods were selected
B) when individual residents were selected
C) when the city was selected
D) A and B
E) all of the above
F) none of the above