There are a number of transformations that can be used to alter the size and position of a shape. These include dilation, translation, reflection, and rotation.
Dilation can be either an enlargement, which results in an image that is larger than the original figure, or a reduction, which results in an image that is smaller than the original figure. If a dilation operation is performed on a shape, we will have a change in the lengths of the shape or the area covered. However, the angles of the shape remain the same since all the sides change by the same factor.
A reflection is a transformation that preserves both size and shape of a polygon or object. All that happens in a reflection is a change in the position and orientation of the shape.
If triangle ABC is dilated and reflected, any change in the side lengths is from the dilation. The angles are preserved, however, both by dilation and reflection.
The correct option is OPTION C.