North Carolina is divided into three main regions: the Coastal Plain, the Piedmont, and the Mountains. These regions are distinct in terms of geography, climate, and culture. The Coastal Plain is a low-lying area along the Atlantic coast, known for its sandy beaches and wetlands. The Piedmont is a hilly region in the central part of the state, characterized by rolling landscapes and urban centers. The Mountains, located in the western part of North Carolina, are part of the Appalachian Mountain range and offer scenic beauty and outdoor recreational opportunities. Therefore, the correct answer is 3.