Answer:
Labor discrimination harms firms that practice it due to increased labor costs
Step-by-step explanation:
Mr. Gary Becker's research addresses the economic impact of discrimination on the economy due to race, ethnicity, sex, color, social status, appearance, or other non-punitive factors. He shows that discrimination by any party in the market place lowers both their own real earnings and those of the minority.
Therefore the second last options fit the current situation and hence it is the correct option.