Final answer:
The information given does not specify the size of the pizza guests will receive. It discusses the variety of topping options and mentions a hypothetical situation with ten guests and twenty brownies for dessert, illustrating allocation rather than size specifics of the pizza.
Step-by-step explanation:
The size of the pizza that a guest will receive if ordered as listed cannot be determined from the information provided. The question refers to the variety of pizza toppings and customization options, but does not specify the size of the pizzas being ordered. In a typical ordering situation, guests would specify not only the toppings they want but also select from available pizza sizes, such as small, medium, large, or extra-large.
When it comes to ordering pizza for a group, it is usual to consider the number of guests and order sufficient quantities to ensure each guest can have a reasonable number of slices. With ten people at a dinner party, the host might order multiple large pizzas assuming each person would have at least two to three slices. This is analogous to the brownie scenario where each guest receives two brownies because there are enough brownies to allocate specifically twenty pieces among ten persons
Since the provided information does not include any details on the actual size of the pizzas, any further explanation on pizza preferences or topping combinations does not lead to a conclusion about the size of the pizza each guest will receive.