Which of the following actions is a violation of the Massachusetts Fair Housing Law?

Refusing to show a property based on race is a clear violation of the Massachusetts Fair Housing Law, which aims to eliminate discrimination in housing based on race, color, national origin, sex, disability, family status, and sexual orientation, among other categories. This law is designed to ensure that all individuals have equal access to housing opportunities, and denying access based on race directly undermines that principle. Such actions contribute to systemic discrimination and are legally prohibited, reinforcing the importance of inclusivity and equality in real estate practices.

In contrast, the other options, while they might raise ethical concerns or lead to potential issues regarding fair practices, do not directly constitute a violation of the Fair Housing Law as they do not involve discrimination against protected classes. For example, failing to advertise a property may simply reflect a business decision, while offering discounts or providing additional services could be seen as a marketing strategy, as long as they are not selectively offered based on the characteristics protected by housing laws.