Answer: Randomization
Explanation:
The randomization is one of the type of method that basically test the effectiveness of the new sources and the treatment in some random manner.
It is the process of studying based on the chance in which the participates are basically assign to the specific treatment group.
According to the given question, the randomization is one of the method that helps in determining the preference of the groups based coin flipping technique.
Therefore, Randomization is the correct answer.
