In the algebraic formula: - 2x, Wu Fen a, B Fen a ten 1, 3 fen 1 (x ten y), n Fen 2 (m-2), 5 fen a ten B, there are () A.3 b.4 C.5 d.6 integers

In the algebraic formula: - 2x, Wu Fen a, B Fen a ten 1, 3 fen 1 (x ten y), n Fen 2 (m-2), 5 fen a ten B, there are () A.3 b.4 C.5 d.6 integers

B