Which statement best differentiates between the Rust Belt region and the rest of the United States?
A. The Rust Belt is a perceptual region that is commonly referred to as such because of its past prominence as an ecoregion.
B. The Rust Belt is a formal region surrounded by functional regions.
C. The Rust Belt is a functional region characterized by similar historic economic activity, specifically, agriculture.
D. The Rust Belt is a functional region characterized by similar historic economic activity, specifically, manufacturing.