O'Neill, Incorporated's segmented income statement for the most recent month is given below. For each of the following questions, refer back to the above original data. The marketing department believes that a promotional campaign at Store A costing $6,000 will increase sales by $15,000. If its plan is adopted, overall company net operating income should:

Select one:

a. decrease by $1,800

b. decrease by $10,200

c. increase by $10,200

d. increase by $1,800