You construct a sample in which Whites, Blacks, and Latinos are randomly selected from the U.S. adult population. The composition of your final sample is 25% White, 30% Black, and 30% Latino. You've sampled from all over the country, but the actual composition of the population has a much higher proportion of Whites. This is likely an example of a:

A.

convenience sample.

B.

multi-stage cluster sample.

C.

voluntary response sample.

D.

simple random sample.

E.

stratified random sample.