Which of the following is the primary purpose of randomly assigning subjects to treatments in an experiment?
A. To produce similar (experimental) groups so any differences in the response variable can be attributed to the explanatory variable
B. To give each subject a 50–50 chance of obtaining a successful outcome
C. To produce a representative sample so results can be generalized to a larger population
D. To simulate what would happen in the long run E. Both A and C