Solve the problem.A doctor has told a patient to take vitamin pills. The patient needs at least 36 units of vitamin A, at least 9 units of vitamin C, and at least 91 units of vitamin D. The red vitamin pills cost 
each and contain 6 units of A, 1 unit of C, and 7 units of D. The blue vitamin pills cost 
each and contain 4 units of A, 1 unit of C, and 14 units of D. How many pills should the patient take each day to minimize costs?
A. 6 red and 3 blue
B. 5 red and 4 blue
C. 4 red and 5 blue
D. 9 red and 0 blue
Answer: B
Mathematics
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