Your company uses two types of occupations. Occupation A pays $40,000 and occupation B pays $50,000. The hiring of an additional A will add $1,000 to total revenue, while one more B will add $1,500 to total revenue. The company should

Select one:

a. Hire one more A since A's salary is cheaper.

b. Hire one more B since the additional revenue per dollar is better than A's additional revenue per dollar.

c. Hire one more B since they produce $500 more in revenue.

Please provide an explanation for your rationale too.