Answer:
B. The reflection preserves the side lengths and angles of triangle. The dilation preserves angles but not side lengths.
Explanation:
A reflection is when the position of an object is shifted and does not affect the side lengths or angle measures of the object. (this eliminates options A. and C.)
A dilation is when you change the size of an object a=and changes the side lengths but does not affect angle measures (this eliminates option D.)
The correct answer is:
B. The reflection preserves the side lengths and angles of triangle. The dilation preserves angles but not side lengths.