Final answer:
The selection most supports the central idea that the pumpkin pie's recipe has connections to medieval traditions, with spices representing wealth and the incorporation of New World crops like squash.
Step-by-step explanation:
The passage suggests that the central idea most supported by the selection is that the recipe for pumpkin pie has historical roots that tie back to the medieval traditions. In the Middle Ages, a blend of spices similar to those found in pumpkin pie today was used across various dishes, symbolizing wealth and status due to the scarcity and value of spices and sugar. This notion aligns well with the provided selection, which emphasizes that rich people flaunted their wealth through feasts featuring these expensive ingredients. Furthermore, the addition of vegetables from the New World, such as squash which is essential to pumpkin pie, embodies the integration of New World crops into European diets after the discovery of the Americas.