**The Color of the Night Sky**

The correct answer for the color of the night sky is option 'C' - black. Let's understand why the night sky appears black and not any other color.

**1. Absence of Sunlight:**
During the night, the Earth is positioned away from the Sun, leading to the absence of direct sunlight. Sunlight is composed of various colors, including red, orange, yellow, green, blue, indigo, and violet. However, at night, the Earth is turned away from the Sun, and the sunlight does not reach the observer. Consequently, the absence of sunlight makes the sky appear darker.

**2. Scattering of Light:**
During the daytime, when the Sun is in the sky, the Earth's atmosphere scatters the sunlight in all directions. This scattering of light is caused by molecules and tiny particles in the atmosphere. The scattering process is more effective for shorter wavelengths, such as blue and green light, compared to longer wavelengths like red and orange. As a result, the scattered light from the blue region of the spectrum is more visible, giving the daytime sky a blue color.

**3. Atmospheric Composition:**
The Earth's atmosphere is composed mainly of nitrogen, oxygen, and trace amounts of other gases. This composition affects the way light interacts with the atmosphere. During the day, the blue light is scattered by the molecules in the atmosphere, making the sky appear blue. However, at night, when there is no direct sunlight, the molecules in the atmosphere do not scatter the light as effectively. As a result, the sky appears darker and closer to its natural color, which is black.

**4. Stellar Visibility:**
During the night, when the sky appears black, it provides an excellent backdrop for observing celestial objects such as stars, planets, and galaxies. The absence of sunlight and the dark sky allow these objects to stand out more prominently, enabling astronomers and stargazers to study and appreciate the wonders of the universe.

In conclusion, the night sky appears black because of the absence of direct sunlight, the scattering of light during the daytime, the atmospheric composition, and the enhancement of stellar visibility.