Beaver Company (a multi-product firm) produces 5,000 units of Product X each year. Each unit of Product X sells for $8 and has a contribution margin of $5. If Product X is discontinued, $18,000 of fixed overhead would be eliminated. As a result of discontinuing Product X, the company's overall operating income would:

A. Decreaseby $25,000

B. Increase by $43,000

C. Decrease by $7,000

D. Increase by $7,000

Please show the work so that I can check my answer.