Answer:
stratified random sampling
Step-by-step explanation:
Stratified random sampling: This is one of the sampling techniques used in research, and is defined as a sampling technique in which a specific population is being divided into similar or identical groups named as "strata" and these strata share similar characteristics. And, from this strata, a particular sample is being selected randomly.
It is deliberately used in research to increase the generalizability of a given research.
The researcher uses a stratified random sampling technique to highlight particular strata within a specif population.