单选题
编号：2690403
1. In a given firm, the marginal product per hour worked for a skilled worker is twice as much as it is for an unskilled worker. Skilled workers earn $20 per hour, and unskilled workers earn $8 per hour. Based on this information, the firm should increase the:
- A.Salary of skilled workers to attract more of them.
- B.Use of skilled workers or decrease the use of unskilled workers.
- C.Use of unskilled workers or decrease the use of skilled workers.