A Laser Beam Is Emitted on Earth (Event $A$ ), Bounces Off a Mirror Placed on the Moon by Bounces

A laser beam is emitted on earth (event $A$ ) , bounces off a mirror placed on the moon by Apollo astronauts (event $B$ ) , and then returns to a detector on earth (event $C$ ) . The detector is $12 \mathrm{~ns}$ of distance from the laser.
-(a) The space time interval between events $A$ and $B$ is:

A) Time like
B) Light like
C) Space like