[单选题]
A star has absolute luminosity equal to that of ths bh3e mf*fc;j9ldx4)7 u4kpa 7n.g hsq0gi9ye 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. $2 \times 10^{-15}$
