John is looking to randomly select 100 students in his college to take part in a graduate research study on underage drinking. He has a list of all students that is numbered. To select participants, he uses a random number table to choose them. What form of sampling is John using?
a. systematic sampling.
b. snowball sampling.
c. simple random sampling.
d. multistage cluster sampling.
e. stratified sampling.
C
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