Why did President Franklin D. Roosevelt make the city of Warm Springs, Georgia, the site of his "Little White House"?

Responses
A He was born in Atlanta, Georgia.He was born in Atlanta, Georgia.
B It was safer from German attack.It was safer from German attack.
C It was safer from Japanese attack.It was safer from Japanese attack.
D The waters helped to ease his polio.

D The waters helped to ease his polio.