One Astronomical Unit is the average distance between

1. Earth and the Sun
2. Earth and the Moon
3. Jupiter and the Sun
4. Pluto and the Sun

Explanation

Option (a) is correct

• One Astronomical Unit (AU) is defined as the average distance between Earth and the Sun. Its value is approximately: 1 AU = 149.6 million km. It is used as a standard unit to measure distances within the solar system.

Answer: (a) Earth and Sun