Why was the manufacturing belt called the rust belt in the latter decades of the 20th century?select one of the options below as your answer:
a. unusually high rates of rainfall caused steel and iron buildings to rust
b. the deterioration of iron into rust aptly described the decline of the iron, steel, and related industries in the region
c. it was named after the geographer, george rust, who had predicted the decline of the manufacturing belt
d. it was used in an advertising campaign to ...