Which of the Following Is Not a Real-World Example of Second-Degree

Which of the following is not a real-world example of second-degree price discrimination?

A) A pizza parlor sells large and small pizzas. Although the large pizzas are twice as big as the small pizzas, they cost less than double the price of a small pizza.
B) An electric company sells "blocks" of power at different prices. Specifically, any customer who buys more that Q1 units of electricity can purchase additional units at a lower block price.
C) Sam's Club® warehouses sell bulk quantities of macaroni and cheese for a cheaper per unit price than a grocery store, but the boxes are packaged together so that the customer must buy six boxes at a time.
D) A movie theater charges senior citizens a cheaper price for movie tickets than it charges non-senior citizens for the same movie ticket.