Earth revolves around the Sun. The changing position of the Big Dipper is due to Earth's orbit around the Sun, not the Moon's influence, alterations in the constellation's composition, or variations in its distance from Earth. Here option A is correct.
The position of the Big Dipper changes during the year because Earth revolves around the Sun. This causes the stars to appear to move across the sky. The Big Dipper is visible in the early evening during fall and spring, but it appears in different positions because of Earth’s orbit around the Sun.
Incorrect Options: The other options are not correct because:
Option B: The position of the Moon does not affect the position of the stars, only the brightness of the night sky.
Option C: The Big Dipper is made of the same seven stars throughout the year. They are called Alkaid, Mizar, Alioth, Megrez, Phecda, Merak, and Dubhe.
Option D: The Big Dipper does not move toward or away from Earth. It is very far away and its distance from Earth does not change significantly. Here option A is correct.