In the month of October, Tran Incorporated had salaries of $15,000 for factory managers, $18,000 for financial managers, and $42,000 for company executives. They also had wages of $98,000 for factory workers and $64,000 for office workers. How much of the labor cost would be considered a product cost between October 1 and October 31?

A : increase by $195,000
B : decrease by $83,000
C : increase by $113,000
D : increase by $237,000