Question

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

Explanation:

Step1: Analyze transformation from 1 to 2

First, observe that from figure 1 to figure 2, the orientation of the triangle changes in a way that is consistent with a reflection. There is no change in the position relative to the grid in terms of sliding, so no translation is involved in going from 1 to 2.

Step2: Analyze transformation from 2 to 3

Then, when going from figure 2 to figure 3, the position of the triangle on the grid changes without any change in its orientation relative to the axes of the grid. This is a translation. There is no rotation as the angles of the triangle relative to the grid - axes do not change.

Answer:

reflection, then translation