Answer:
D. Together they expanded highways, built airports, encouraged Civil Rights and brought professional sports
Explanation:
The statement that BEST describes how William Hartsfield and Ivan Allen Jr. aided in the expanse and growth of Atlanta is "Together they expanded highways, built airports, encouraged Civil Rights and brought professional sports."
The above statement is true because William Hartsfield, the 49th and 51st mayor of Atlanta, was known for achieving many positive things, including expanded highways, built airports such as Hartsfield Jackson Atlanta International Airport, encouraged Civil Rights by creating the slogan "the city too busy to hate," and brought professional sports.
Similarly, Ivan Allen Jr., the 52nd mayor of Atlanta was also known for expanding the highways, building airports, encouraged Civil Rights by partnering with Martin Luther King Jr., and other African American leaders, and brought professional sports.