The correct answer is B. The phases of the Moon are a result of the Moon's orbit around Earth. As the Moon orbits around Earth, the portion of the Moon that is illuminated by the Sun changes, causing the appearance of different phases, such as new moon, first quarter, full moon, and last quarter.
The phases of the Moon are a result of the Moon's orbit around the Earth, so the correct answer is B. The Moon takes approximately 29.5 days to complete one orbit around the Earth, which is known as a lunar month. As it orbits around the Earth, the Moon appears to change its shape in the sky, which are the different phases of the Moon.
