Which type of transformation does NOT result in a figure that is congruent to the original one?

a. dilation

b. reflection

c. rotation

d. translation

The correct answer is a.

Congruent means that two figures are the same shapes and sizes. Dilation means that something grows bigger. If a figure becomes bigger, then it may remain the same shape but it will not be the same size. Thus, it will not be congruent.