Answer:Three choices for size, two choices for crust, and two choices for topping
StepSizes = Small, Medium and Large, so they has 3 choices for size.
Crust = Thin or thick for each size, so they have 2 choices for crust.
Topping = Tomato or meatball for each one, so they have 2 choices for toppings.
The answer would be:
Three choices for size, two choices for crust, and two choices for topping