Pet Food inc. has two product lines: Cet food and Dog food. Contribution margin income statement data for the most recent year follow: Assuming total fixed costs remain unchanged, how would discontinuing the Dog food line affect operating income? A. Decrease in total operating income of $415,000 B. increase in total operating income of $7,000 c. Decrease in total operating income of $45,000 D. Increase in fotal operating income of $185,000