Final answer:
A modern residential toilet typically discharges 1.6 gallons per flush into the waste system, which demonstrates improved water efficiency over older models.Option B is the correct answer.
Step-by-step explanation:
The quantity of water that a modern residential toilet discharges into the waste system is 1.6 gallons per flush (gpf),option B. This reflects advancements in water efficiency in household appliances and fixtures. Specifically, improvements in toilet design have played a significant role in reducing the water used per flush, significantly since the late 1990s. Today's toilets use notably less water compared to older models that could use upwards of 3.5 gpf.
In recent years, the push for eco-friendly practices has led to advancements in residential toilet design, exemplified by the 1.6 gpf standard. This reflects a conscious effort to conserve water and enhance sustainability in household fixtures. The evolution from older models, using over 3.5 gpf, underscores the industry's commitment to environmental responsibility.
Efforts toward water conservation and sustainability drive modern residential toilet innovations.