Final answer:
The climates of their individual regions had the greatest factor in shaping North American cultural groups.
Step-by-step explanation:
The greatest factor in shaping North American cultural groups was C. The climates of their individual regions.
The diverse and varying climates across North America influenced the types of food sources available, the types of shelter and clothing used, and the overall way of life for different cultural groups.
For example, the Inuit people of the Arctic region adapted to the cold climate by relying on hunting seals and other marine mammals, while the Native American tribes in the Southwest adapted to the desert climate by practicing irrigation agriculture.
Learn more about North American cultural groups