(A) Light year (X)
(B) Astronomical Unit (✔)
(C) parsec (X)
(D) parallax (X)
(E) None of these (X)
Answer: Astronomical Unit
(A) Light year (X)
(B) Astronomical Unit (✔)
(C) parsec (X)
(D) parallax (X)
(E) None of these (X)
Answer: Astronomical Unit
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