In an Experiment Comparing Two Treatments,the Researcher Assigns Participants to Treatment

Multiple Choice

In an experiment comparing two treatments,the researcher assigns participants to treatment conditions so that each condition has 15 seven-year-old children and 10 eight-year-old children.For this study,what method is being used to control participant age?

A) ​randomization
B) ​matching
C) holding constant
D) ​limiting the range