Final answer:
The PRIZM segment for singles and young families in rural areas who like country music and shop at Walmart is 'Young & Rustic'.
Step-by-step explanation:
The PRIZM segment that consists of singles and young families who live in rural areas, enjoy country music, and typically shop at Walmart is the 'Young & Rustic' segment. This segment is characterized by a lifestyle that blends a love for rural living with modern conveniences. People in the 'Young & Rustic' segment typically live outside of metropolitan areas, enjoy outdoor activities, and prefer a country-centric lifestyle while still engaging with popular retail stores and entertainment.