In the United States, Divisive Political Issues Have Caused Deep

In the United States, divisive political issues have caused deep cleavages in society but have not upset the two-party system because

A) issues are not important to American voters.
B) too few voters are actually members of political parties.
C) parties have usually changed their policies enough to keep dissidents from breaking away.
D) issues change too rapidly to matter over long periods of time.
E) Americans are highly interested and informed about politics and move on to different issues.