6. On a given evening, Jack enjoys the consumption of cigars
(c) and brandy
(b) according to the function $$U(c, b) = 20c c^2 + 18b 3b^2.$$ Jack has been advised by his doctors that he should limit the sum of glasses of brandy and cigars consumed to 5. Assume that cost is no object to him. In order to maximize his utility, how many glasses of brandy will Jack consume under these circumstances?
(A) 1
(B) 2
(C) 3
(D) 4

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