Which of the following best defines 'living space' in a dwelling unit?

The definition of 'living space' in a dwelling unit encompasses areas designed for essential activities related to daily living. This includes spaces where individuals perform fundamental functions such as sleeping, eating, and bathing, as well as cooking and sanitation. These activities are crucial for the overall quality of life within a home, making the living space integral to the functionality and comfort of a dwelling unit.

In contrast, spaces for storage do not directly contribute to the daily activities of living. Likewise, areas designated solely for mechanical systems, such as HVAC or plumbing, serve specialized purposes that do not form part of the daily living environment. While entertainment spaces can be part of a home, they do not encompass the basic living functions defined in the broader concept of living space. Thus, option C captures the essence of living space accurately by including all the vital functions associated with day-to-day living.