What if a company employs ten workers and pays each $15 each hour. Further suppose that the MP of the 10th worker is five units of output and that the price of the output is $4. According to economic theory, in the short run,

a. the firm should hire additional workers.
b. the firm should reduce the number of workers employed.
c. the firm should continue to employ 10 workers.
d. More information is required to answer this question.