Answer: A and c.
Step-by-step explanation: No matter the arrangement, those seem to be the same. The first option is a reflection of the y axis and it's still the same shape. B's shape changes, which doesn't make it congruent. The option after that is a rotation, and once again, it hasn't changed its congruence. The last option has different shapes, so those aren't congruent either.
Let me know if it's right! :)
