Step-by-step explanation:
A. Adding a square in the top left corner increases the perimeter. It removes one side and adds three. So the perimeter increases from 14 to 16.
B. Adding a square in the top center leaves the perimeter the same. It removes two sides but also adds two sides. So the perimeter is left at 14.
C. Adding a square to the bottom center decreases the perimeter. It removes three sides and adds one. So the perimeter decreases from 14 to 12.
