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Explanation:

Option (a): (-99) + (-44) - 12   = -ve

Option (b): 20 + 4 + (-8) - 2 + 3 + 6 = 33 - 10 = 23 (the only +ve value)

Option (c): (-18) - 45 + (- 3 - 2)  = -ve

Option (d): (-22) + (- 4 - 7) = -ve

Hence, option (b).

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