Answer:
The correct option is A: Standardization
Explanation:
Standardization is a method used in research for gathering and treating participants for a particular study. It is used when the result of one group is to be compared with the result of a second group, and hence each group must be given equal opportunities to succeed. This process is often lengthy. Bob used this sample of children because he wanted standardization.
Are effective for individualized training and for classroom training.
all of the other answer seem unnecessary!!