The reasons a voter in 1964 may have had for NOT voting for a conservative was that conservatives were considered "kooks." Option B is correct.
Conservatives in 1964 supported racial inequality and segregation, as well as the war in Vietnam.
In the late 1950s and early 1960s conservatives were widely dismissed as "kooks" and "crackpots" without chances of winning political power.
Conservatism refers to a political as well as social philosophy promoting traditional social institutions in the context of culture and civilization.