Pet Food Inc. has two product lines: Cat food and Dog food. Contribution margin income statement data for the most recent year follow. Total Dog Food Sales revenue $385,000 $85,000 $62,000 $40,000 $323,000 $45,000 Variable expenses Contribution margin Fixed expenses Operating income (loss) $100,000 $52,000 $223,000 $(7,000) Assuming total fixed costs remain unchanged, how would discontinuing the Dog food line affect operating income? OA. Increase in total operating income of $7,000 OB. Decrease in total operating income of $45,000 OC. Increase in total operating income of $178,000 OD. Decrease in total operating income of $401,000 Cat Food $300,000 $22,000 $278,000 $48,000 $230,000 CUD