Answer:
B, 300 billion kilometers
Step-by-step explanation:
The astronomical unit (AU) is the unit of length equaling the distance between the Sun and the Earth. This unit is applied when measuring the various distances within the Solar System. 1 AU = 150 million kilometers or 93 million miles. This distance may vary as the Earth orbits the Sun during the astrological year.
2000 AU = 299195741382 kilometers which is approximately 300 billion km.