Answer :
The best description of the realignment of 1968 is (d) After 1968, there was a slow-motion realignment that left the nation almost evenly divided in politics.
Realignment in 1968 did not create a definitive majority for either Democrats or Republicans but led to a more competitive two-party system. The Democratic Party maintained some strength, but support weakened from the 1970s onward while Republicans did not see a corresponding consistent increase.
This trend led to more independents and a more balanced political landscape.