According to the basic principles, which fixtures are required in a dwelling?

The correct answer identifies the essential fixtures required in a dwelling according to plumbing codes. A kitchen sink, lavatory (which is the sink in a bathroom), water closet (toilet), and either a soap or bidet are considered basic sanitary facilities that ensure proper hygiene and functionality within a home. These fixtures address various needs: the kitchen sink aids in food preparation and cleaning, the lavatory is essential for personal hygiene activities, and the water closet provides necessary waste management.

The inclusion of a soap dispenser or bidet is reflective of modern plumbing standards that prioritize sanitation and personal care. In many cases, plumbing codes require at least one of these fixtures, reinforcing the necessity of appropriate hygiene facilities in residential settings.

Other options may include similar fixtures but might lack one of the essential components identified in the correct answer. For instance, some combinations might leave out the lavatory or include spaces like a "sink" that do not specify the bathroom context, ultimately falling short of meeting the full requirements of sanitary plumbing as outlined in the standards for dwellings.