Answer: Stratified random sampling
Explanation:
In stratified random sampling the population of choice is partitioned into subgroups. Then the samples for study are selected randomly from the subgroups.
The given situation is the example of stratified random sampling this is because of the fact that the population is divided into subgroups on the basis of the social class and age. Then the voters were randomly selected from each subgroup.
Answer C The government paid a cash loan to the buyer; the buyer paid back the loan plus interest.