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A pollster wants to determine the support of a congressional candidate in a certain district.

The pollster selects the $12\text{ counties}$ the district represents then randomly selects $10\text{ towns}$ in each of the $12\text{ counties}$. Finally, he randomly selects $10\text{ subjects}$ in each town for a total of $1{,}200\text{ respondents}$ in the sample.

What type of sample best describes this situation?

A

Simple random sample.

B

Stratified sample, where county is the strata.

C

Stratified sample, where town is the strata.

D

Multistage sample.

E

Observational study.

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