A Light Flash Leaves a Master Clock At $x=0$ At Time $t=-12 \mathrm{~s}$

Multiple Choice

A light flash leaves a master clock at $x=0$ at time $t=-12 \mathrm{~s}$ , is reflected from an object a certain distance in the $-x$ direction from the origin, and then returns to the origin at $t=+8 \mathrm{~s}$ . From this information, we can infer that the spacetime coordinates of the reflection event are $[t, x]=$

A) $[4 \mathrm{~s}, 20 \mathrm{~s}]$
B) $[-4 s,-20 s]$
C) $[10 \mathrm{~s},-2 \mathrm{~s}]$
D) $[2 \mathrm{~s},-10 \mathrm{~s}]$
E) $[-2 s,-10 s]$
F) Other (specify)