To Make Their Famous Daddy's Deluxe Italian Sandwiches, Santino's Sandwich

To make their famous Daddy's Deluxe Italian Sandwiches, Santino's Sandwich Emporium finely slices prime meats, stacks them on Italian bread, adds special seasonings, cheeses, and veggies. The value added by Santinos's when it combines these ingredients to make a sandwich is known as

A) consumer surplus.
B) the analytic function.
C) marginal utility.
D) form utility.