Brandi company is deciding wether or not to discontinue one of its divisions. The division's contribution margin is $27,000 per year. The fixed costs charged to the division total $32,000, but $15,000 would be eliminated if the divsion is discontinued. If the division is eliminated, the overall operating income would

a. Decrease by $9,000

b. Decrease by $12,000

c. Decrease by $15,000

d. Increase by $27,000