Suppose you were conducting a simulation with cards to compare the means of three groups of test scores. The groups consisted of samples of size 8, 10, and 12. Which of the following best describes one repetition of the simulation?
A. Take 30 cards and write down each test score on a card, shuffle all the cards, and make three piles of 10 cards. Find the means for all three piles and from these compute a MAD statistic.

B. Take 8 red, 10 blue, and 12 green cards, shuffle all the cards, and make a pile of 8 cards, a pile of 10 cards, and a pile of 12 cards. Find the proportion of red cards in each group and from these compute the MAD statistic.

C. Take 30 cards and write down each test score on a card, shuffle all the cards, and make a pile of 8 cards, a pile of 10 cards, and a pile of 12 cards. Find the means for all three piles and then find the average of all these means.
D. Take 30 cards and write down each test score on a card, shuffle all the cards, and make a pile of 8 cards, a pile of 10 cards, and a pile of 12 cards. Find the means for all three piles and from these compute a MAD statistic.