Refer to the Graph, Where TP = Total Product and L

Multiple Choice

Refer to the graph, where TP = total product and L = labor input. If this graph is for a firm that sells its product in a purely competitive market, then its marginal revenue product of labor (MRP)

A) is constant at all levels of L.
B) increases at an increasing rate as L increases.
C) decreases as the labor input L increases.
D) increases at a decreasing rate as L increases.