Question

the population of a town is divided into three age categories. a random sample of each category is surveyed about voting choices. this type of sampling is called
cluster sampling.
stratified sampling.
simple random sampling.
systematic random sampling.

Explanation:

Stratified sampling divides the population into subgroups (strata) based on certain characteristics (here, age categories) and then samples from each subgroup. Cluster sampling groups the population into clusters and samples entire clusters. Simple random sampling selects individuals randomly from the whole population without dividing it first. Systematic random sampling selects elements at regular intervals from an ordered list.

Answer:

stratified sampling.