In a translation, the y-coordinates of the pre-image increase by 8. what was the translation?
8 units up

8 units down

8 units left

8 units right

Y coordinates control up and down

increase by 8 means go up by 8

8 units up

So,

A translation is a transformation in which the figure is simply moved across space; the preimage is congruent to the image.

We are told that the y-coordinate of the preimage increase by 8.  We know that the y-coordinates have to do with vertical movement on a coordinate plane.  Since the y-coordinates increased by 8, the preimage was moved up 8 units.

The correct option is A.