Riverside Industries Has Three Product Lines, A, B, and C

Riverside Industries has three product lines, A, B, and C.The following information is available: $\begin{array}{l}&A&B&C\\\text { Sales } & \$ 100,000 & \$ 90,000 & \$ 44,000 \\\text { Variable costs } & \underline{76,000} & \underline{48,000} & \underline{35,000} \\\text { Contribution margin } & \$ 24,000 & \$ 42,000 & \$ 9,000\\\text { Fixed costs: }\\\text { Avoidable } & 9,000 & 18,000 & 3,000 \\\text { Unavoidable } & \underline{6,000} & 9,000 & \underline{7,700} \\\text { Operating income } & \$ 9,000 & \$ 15,000 & \$ 1,700) \end{array}$ Riverside Industries is thinking of dropping product line C because it is reporting a loss.Assuming Riverside drops line C and does not replace it, the operating income will _____.

A) increase by $2,400
B) increase by $600
C) decrease by $6,000
D) decrease by $9,000