A unit of length equal to the average distance between the Earth and Sun is called:

(A) Light year
(B) Astronomical unit
(C) Parsec
(D) Parallax

Q. What is the symbol of Astronomical unit? 
(A) AU
(B) ASU
(C) ALU
(D) AST-U

Q. The light year is a unit of length used to express _______ distances.
(A) Levenshtein
(B) Lee
(C) Astronomical
(D) None of these

Answers:
1. (B) Astronomical unit
2. (A) AU
3. (C) Astronomical