What’s the correct answer for this?

Answer: (A) 16 units
Step-by-step explanation:
You can imagine moving Point A to the coordinate (-1,2) and Point B to coordinate (-1,6). This then allows you to count 4 units on the one side and 4 units on the other. 4 times 4 is 16!
I used the area of polygon formula to find this answer. hope it help you! ;)