(A) $Parsec$ (parallax second) is a unit of length used to measure the large distances to astronomical objects outside the Solar System.It is defined

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(A) $Parsec$ (parallax second) is a unit of length used to measure the large distances to astronomical objects outside the Solar System.It is defined as the distance at which one astronomical unit $(AU)$ subtends an angle of one arcsecond.$1 \ Parsec \approx 3.086 \times 10^{16} \ m$.Therefore,the correct option is $A$.