If a, C, D are integers and B is a positive integer, and a + B = C, B + C = D, C + D = a is satisfied, then the maximum value of a + B + C + D is () A. -1B. -5C. 0D. 1

∵ a + B = C, ∵ a = C-B, and ∵ B + C = D, C + D = a, a = C-B, ∵ C = - 2b, a = - 3b, d = - B, ∵ a + B + C + D = - 5b, ∵ B is a positive integer, its minimum value is 1, and the maximum value of ∵ a + B + C + D = - 5b is - 5

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