Answer:
Not Human Subjects
Explanation:
A master's degree candidate conducting a research study on her master's thesis is interested in the type of junk food available in the local convenience stores.
The student approaches a local convenience stores and make inquiries of the availability of the type of junk food in the store and also asks about the famous seller or the biggest seller of junk food on that locality.
It is also mentioned that the identifiers will not be collected.
Thus it is a study done where no human subject is included, only junk food items and convenience stores are the subjects of the study.
Thus the answer is "Not Human Subjects".