A Local Cheese Producer Feels Their Biggest Problem Is to Get

A local cheese producer feels their biggest problem is to get consumers acquainted with their product. An experiment is run in which 50 free samples of cheddar cheese are distributed to a randomly selected sample of families. This group and another group of 1,000 randomly selected people to which free samples had not been given are both sent coupons for the purchase of cheddar cheese at a discount at local grocery stores. The keyed coupons show that 387 coupons are returned from the group receiving the free sample and 130 are received from the other group.
Answer the following three questions on the basis of this information.
-The design being used in the study is

A)
R 0₁ X $\quad$ 0₂
R 0₃ $\quad$ 0₄
B)
R $\quad$ X $\quad$ 0₁
R $\quad$$\quad$ 0₂
C)
R $\quad$ X $\quad$ 0₁0₂
R $\quad$$\quad$ 0₃0₄
D)
R 0₁ X $\quad$ 0₂
R $\quad\quad$$\quad$ 0₃
E) none of the above.