The option which gets you more pizza is two 12" pizzas.
<h3>What is a Diameter?</h3>
It can be defined as the longestchord of the circle and it is twice the size of a radius.
We were told that one 18" pizza or two 12" pizzas costs the same and the one with the largest size is two 12" pizzas which was why it was chosen as the most appropriate choice.