Answer:
Pizza Party is the best deal.
Explanation:
Pizza Party offers the best deal for Carl, because he wants to by 2 pizzas.
So, Pizza Palace is offering a large 1-topping pizza for $9.99. Both pizzas will cost around $20.
On the other hand, Pizza Party offers a 2x1, one large 1-topping pizza costs 18, and the second one is free. So, two pizzas will cost $18, which is $2 less than Pizza Palace offer.
Therefore, the right answer is Pizza Party.