What is the value of parallactic seconds (parsec) in S.I units?

Question

$\begin{array}{1 1}(A)\;3.1 \times 10^{16}m \\(B)\;2.3 \times 10^{7}m \\(C)\;9 \times 10^{8}m \\(D)\;25 \times 10^{3}m \end{array}$