A Parsec Is I. a Unit of Length Used in Astronomy

A parsec is
I. a unit of length used in astronomy
II. 2.06 × 10⁵ AU
III. the distance to an imaginary star whose stellar parallax is one arc second
IV. 3.26 light years
V. the longest unit of length in astronomy

A) I, II, V
B) II, IV
C) I, III, IV, V
D) I, II, III, IV, IV