6

A doctor has told a sick patient to take vitamin pills. The patient needs at least 35 units of vitaminA, at least 7 units of vitaminB, and at least 25 units of vitamin C. The red vitamin pills cost 10 each and contain 8 units ofA, 1 unit ofB, and 3 units of C. The blue vitamin pills cost 20 each and contain 3 units ofA, 1 unit ofB, and 5 units of C. How many pills should the patient take each day to minimizecosts?

A. 6 red and 1 blue

B. 2 red and 5 blue

C. 5 red and 2 blue

D. 7 red and 0 blue