Answer: C, the third one
Explanation:
Because the first one has a rotation of 90 degrees counterclockwise, it is not only a translation, the second one has a translation, but also rotates 90 degrees clockwise, the fourth one translates upward, but then reflects, or perhaps rotates 180° clockwise/counterclockwise. The only one that does not appear to rotate or reflect is the third one, which simply translates up and slightly to the right.