Question

translation, then rotation
reflection, then translation
translation, then reflection
reflection, then rotation

Explanation:

Step1: Analyze transformation from 1 to 2

First, observe that the shape of figure 1 is moved to the right - this is a translation.

Step2: Analyze transformation from 2 to 3

Then, figure 2 is flipped over a vertical line to get figure 3 - this is a reflection.

Answer:

translation, then reflection