The resulting sampling technique is Stratified sampling.
As in the concept of statistical study, sampling methods refer to how we select members from the population to be in the study and if a sample isn't randomly selected, it will probably be biased in some way and the data may not be representative of the population.
Here we need to find the type of sampling method.
Here the Stratified random sampling involves classifying the units of the population into different strata.
And the give units in each stratum should possess similar characteristics which then allows the researcher to pick a sample from each.
Then the stratified sampling approach can be divided into proportionate stratified sampling and disproportionate stratified sampling
Therefore, these method is employed in cases where the population is heterogeneous.
So, option (b) is correct.
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