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C is corrent.  In analyzing a special order, the incremental revenue less the incremental costs determines the effect on operating income.  The incremental revenue is the selling price of the special order gloves, $12.00 per pair.  Incremental costs include only the variable costs of $9.00 per pair.  Fixed costs are not included since they do not change in the short run.  The effect on operating income is calculated as follows:


A is incorrect. The solution is determined by comparig incremental revenue to incremental costs. 
B is incorrect. The solution is determined by comparing incremental revenue to incremental costs. 
D is incorrect. The solution is determined by comparing incremental revenue to incremental costs.