According to the textbook, which of the following statements about the evolution of political parties is true?

The two-party system has undergone significnt changes since the civil rights movement due to third parties successfully challenging major party candidates, resulting in both major parties taking more liberal positions on equality issues

Although the United States has had a two-party system since the 1780s, the nature of the parties has changed over time with various issues and events producing fluctuations in the parties' members and positions

With growing electoral compeition, the two-party system in the United States has produced more moderate parties that lack distinct positions due to candidates trying to appeal to moderate swing voters

The Democratic Party has remained static in its membership and policy positions, while the Republican Party grew more conservative after the Tea Party movement took hold after 2009