Let us start by writing the coordinates of the parent image and transformed image
Coordinates of the parent image

Coordinates of the transformed image

From the coordinates of the parent image and the transformed image collated above, we can conclude that the x-axis of the parent image was multiplied by (-) negative sign while the y-values remaining constant.
The mathematical representation is,

Checking for confirmation

Therefore, the rule that satisfies the transformation is a reflection across the y-axis.
The correct option is Option 5.