Answer:
Quota sampling
Explanation:
Quota sampling: It gathers representative data from a particular group of people. In this sampling method, the data is being chosen from a particular sub-group of a population. This is considered to be more reliable as compared to other non-probability sampling methods such as snowball sampling.
Example: A researcher can take 200 males participants between the age of 18-25.
In the given question, the graph represents the quota sampling method.