[单选题]
A star has absolute luminosity cdhhcn+6rc 8 d)mf+ vi6wn-f7qj5a b6e/ xpxtxa 33m3xa33vxfqual 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. $2 \times 10^{-15}$
