Suppose the MRP of a Firm's 12^th Worker Is $22

Suppose the MRP of a firm's 12^th worker is $22 and the worker's marginal wage cost is $16.We can say with certainty that the firm:

A) is hiring labor in a competitive labor market at a wage rate of $16.
B) is hiring labor in a monopsonistic labor market.
C) will find it profitable to hire fewer workers.
D) will find it profitable to hire more workers.