Me hahahaha i need with this whole review if anyone can comment

I have a little trick for this because I never remembered the actual steps to take. What you want to do is take their distance from the reflexion axis and double it. For example:

Reflects across y=-1
R: (2,0)       Distance from y=-1 is -1
double it is -2
R: (2,-2)

S: (1,3)       Distance from y=-1 is -4
double it is -8
S (1,-5)

T: (4,2)       Distance from y=-1 is -3
double it is -6
T: (4,-4)

If you can figure out how I did this than good job, this should be easier for any other translation problems.

The answer would be: b