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## To minimize the cost, Don Garcia should take only green pills. Each green pill provides 4 units of vitamin A, so he will need a total of 24/4 = 6 green pills to meet his vitamin A requirement.

The cost of each green pill is 3.5 cents, so the total cost for 6 green pills would be 6 * 3.5 = 21 cents.

Using red pills would not minimize the cost in this case because each red pill provides only 1 unit of vitamin A, and Don Garcia would need 24 red pills which would cost 24 cents. Therefore, it is more cost-effective for him to take the green pills exclusively.