Which of the following is considered an unfair trade practice?

Charging fees based on race or religion is considered an unfair trade practice because it discriminates against individuals based on protected characteristics, violating anti-discrimination laws and ethical standards in business. This type of practice undermines the principle of fair competition and equal treatment, harming both the reputation of the business and the trust of consumers. In contrast, the other options, such as providing rebates, discounting for early payments, or offering free consultations, are generally accepted practices that can create value for customers and are typically encouraged in competitive business environments. These practices do not involve discrimination and are viewed as legitimate marketing strategies.