Final answer:
The ingredients for a PBC&B Sundae would be peanut butter cups, banana slices, and either vanilla or chocolate custard as the creamy base.
Step-by-step explanation:
To answer the question of which ingredients are used to make a PBC&B Sundae, we first need to identify what the acronym stands for. PBC&B likely stands for Peanut Butter Cup & Banana. Therefore, the three ingredients chosen from the list provided would be: c. Peanut butter cup, d. Banana slices, and a choice between a. Vanilla custard or b. Chocolate custard as the frozen dessert base. It's essential to consider the classic components of a sundae, such as a creamy base and flavorful toppings. In this case, vanilla or chocolate custard provides the creamy base, while peanut butter cups and banana slices serve as the toppings that specifically complement the acronym PBC&B.