Us cities with names that have references to something circular

Pi Scavenger Hunt

By: Holly T.

6 US state flags which include circles in their design

7 Recipes for different kinds of pies

1 US city with a ZIP code containing the first 5 digits of pi -- beginning with the 3

Apple Pie

Blueberry Pie

Chocolate Chip Cookie Pie

answer; (b); i believe its indefinite existence of human population in a healthy and prosperous condition;