HELP SOS. Choose the transformations that preserve congruence. reflection

rotation

translation

dilation

A transformation that preserves congruence is called an isometry. ... Translations, reflections, and rotations are isometries. A translation is considered a “direct isometry” because it not only maintains congruence, but it also, unlike reflections and rotations, preserves its orientation.

Explanation:

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

i'm pretty sure its b i might be wrong though!