[单选题]
A star has absolute luminosity eq3xxtrr 8 x : fh.-im:(hm-pqd/sl5yfuuall64a h:nujrs 2 to that of the Sun ($1.5 \times 10^{8} \; km$ from the Earth) but is 10 pc away from the Earth. By what factor will it appear dimmer than the Sun?
A. $2 \times 10^{-9}$
B. $2 \times 10^{-11}$
C. $2 \times 10^{-13}$
D. $2 \times 10^{-15}$
