Final answer:
All concerns listed, including employees' lack of courtesy, the quality of merchandise, and the quality of service, are problematic and necessitate immediate action from companies to maintain customer satisfaction and their reputation. The correct option is d.
Step-by-step explanation:
A concern that is problematic and compels companies to take immediate action could be all of the above: employees' lack of courtesy, the quality of merchandise, and the quality of service. These issues can directly affect customer satisfaction and a company's reputation.
In particular, businesses facing issues regarding employee treatment or discriminatory practices, such as underpaying workers, need to be attentive. If employees feel discriminated against or are being underpaid, they may leave for better opportunities. Such market pressure could necessitate immediate action from the company to improve its practices and retain its workforce.
Hence, Option d is correct.