Final answer:
The Jazz Age occurred after WWI, during the 1920s, and ended with the Great Depression in 1929.
Step-by-step explanation:
The Jazz Age refers to the 1920s, a period after World War I known for its cultural dynamism and the rise of jazz music as a popular genre. This age is characterized by economic growth, the thriving of bootlegging businesses due to Prohibition, and the proliferation of new ideas and modes of expression. The Jazz Age followed the end of WWI in 1918 and came to a close with the onset of the Great Depression in 1929, which means the correct answer to when the Jazz Age was is after WWI (a).