How did former mayor of Atlanta, Ivan Allen, Jr., help the city to develop economically? A. He used taxes to help aircraft companies build factories in the city, which helped Atlanta gain military contracts during World War II. O B. He brought professional sports teams to Atlanta, which helped create the infrastructure that would allow it to host the Olympics. C. He created tax breaks to encourage movie studios to film in the city, which helped Atlanta's movie industry expand. O D. He established the first international airport in the city, which helped Atlanta to become a global tourist destination.