An Upward-Sloping Supply Curve of Labor Reflects the Fact That

An upward-sloping supply curve of labor reflects the fact that the

A) demand for the good is increasing causing its price to increase
B) population size in the region is increasing
C) workers are willing to supply a greater quantity of labor at higher wage rates
D) marginal revenue product rises as the wage rate rises
E) workers' opportunity costs are falling as the wage rises