Answer:
Set A
Step-by-step explanation:
Reflection is a flip, so you need to flip the rectangle over the x-axis. So since the rectangle will end in quadrant 4, the x coordinates are all positive and the y coordinates are all negatives. Look at your choices and see what you can eliminate. Set B & C are out because they have negative x coordinates. Set D is out because the y coordinates are NOT negative, so that leaves Set A as the answer.
