Convenience sample is employed.
Option e
Convenient Sampling is the type of sampling which select the test subject based on the researcher’s convenient to access them and their close proximity to the researcher. The researcher doesn’t consider the entire population but only focuses on those that easy to recruit.
Convenience sampling is the viable method in most research since it is not possible to include the entire population for research purposes therefore this kind of sampling is convenient and viable. Furthermore, in terms of cost it is cheaper, it is also easier to execute and may provide fats results.