The answer to this would be a translation 3 units left and a reflection across the y axis. The y and not the x because a reflection like that would have the second shape on the lower half of the graph which is not what we want. 3 units left because 3 units right would put it on the right half of the y axis and reflect it the wrong way.
translation 3 units left then a reflection across y-axis you can see that moving ABC 3 to left makes it look like a mirror image of DEF on other side of y-axis, that's what a reflection across the y will do
