The BEST response that states why membership in the Ku Klux Klan rose significantly during the 1920s is A. The Klan manipulated people’s fears about a changing society.
During this time, America was experiencing significant social changes, including immigration, urbanization, and changing gender roles, which many people found threatening. The Klan capitalized on these fears and promoted a narrative of American purity and traditional values, attracting members by addressing their anxieties about these changes.