Which of the following is the best example of random selection?

a. Splitting the alphabet in half to determine who will be in the experimental or control group.
b. Having all participants count off by twos and then placing all of the odd-numbered participants into the experimental group
c. Arbitrarily selecting names from everyone in the population to determine who will be in the study
d. Determining all of the individuals who can potentially participate in the study
e. Selecting every tenth name from the census to determine who will be in the study