Among the Following People, Who Earns a Profit

Among the following people, who earns a profit?

A) a construction worker who would work for $40 per hour but actually earns $50 per hour
B) a heart surgeon who earns $400,000 a year
C) an entrepreneur who earns $25,000 a year
D) a land owner who receives $600 per acre for the 1,000 acres he owns
E) a homemaker whose work is valued at $100,00 a year even though she earns $0