Answer:
The type of sampling used in Jankowski's study of gangs is Option D. Stratified sampling.
Explanation:
With stratified sampling, the researcher will partition the population into different groups, usually based on some characteristic that is common to that group. In this case, it was the different kinds of gang membership. Then, the researcher will take a sample of people within each specific group using another sampling method like simple random sampling for instance. The groups that are used in stratified sampling are called strata. Another example would be a national survey that is divided into strata of the different major ethnic groups that comprise the national population.
The answer is letter A. The Clear Air Act would be a reason for the Environmental Protection Agency or EPA to regulate car emissions. EPA sets the emission standards under the said rule or regulation and this also covers the green house gas emissions.
C
I would like to believe C is the correct answer, I hope this helps!!
Tools probably as they show more of the history. They're primary resources.
Architecture may show more religion and political institutions though.