Answer:
Convenience sampling
Explanation:
Convenience sampling involves the use of the first available source of primary data without having to add any other requirement. In other words, it is a sampling method which is totally dependent on collection of data from convenient available members. In this method, researchers simply make use of participants wherever they are found and is convenient. Like in the case of the example, the students simply administered the survey to 10 of their friends who were available and would be conveniently participate in the study.