Answer:
A.
Step-by-step explanation:
A fun way of solving it is by turning your image 90 degrees, and observing the original figure. You can also solve it by checking the points.
(I am sorry if this wasn't very good.)
If the width is 2p then the width of both sides is 4p. Subtract that from the total perimeter and you get 16p-4p= 12p. Divide that by two because there are 2 side lengths. So, one side length is 6p.