Final answer:
The expression that represents the difference between the areas of Circle A and Circle B is 3A.
Step-by-step explanation:
The expression that represents the difference between the areas of Circle A and Circle B is 4 times the area of Circle B minus the area of Circle B.
Let's say the area of Circle B is A. Then, the area of Circle A would be A/4. Therefore, the difference between the areas is 4A - A = 3A.
So, the expression for the difference in areas is 3A.