The correct option is B i.e. that affords them adequate amounts of natural light.
What is natural light?
Natural light, whose main source is the Sun, is simply light that is produced naturally. Artificial light, on the other hand, is often created by electrical devices like lamps.
During the day, the visible spectrum of natural light, with violet at one end and red at the other, is received. Natural light serves as a good source of vitamin D, is beneficial to health, and is necessary for plants to perform photosynthesis. Fire and, on clear nights, the moon is other natural light sources. A pleasant setting can be created by using natural light, which can also help to regulate the body clock, increase focus, and create a serene, peaceful atmosphere.
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