Answer:
D. Translation right and down
Explanation:
A: A translation left would keep the figure in the same quadrant. Moving left would just go off the graph, so it can't be this.
B: A rotation 180° would result in the vertices upside down. The shape would also be at different points, so this is incorrect.
C: A reflection over the x-axis would put the new figure directly underneath the original. This is not the case.
Which leaves D, the correct answer :)