Final answer:
The true statement about the U.S. political party system is option b, which states it has experienced broad changes with parties rising and declining over the years. This reflects the historical evolution of U.S. political parties, from the early Federalists and Democratic-Republicans to the modern-day Democratic and Republican parties.
Step-by-step explanation:
The correct statement about the U.S. political party system is that it has experienced broad changes, with parties rising and declining over the years. This describes the reality that the United States didn't start with the current two-party system. Initially, political factions such as the Federalists and the Democratic-Republicans emerged, with the latter evolving into what we recognize today as the Democratic Party. The Whig Party, which was prominent in the mid-19th century, eventually disappeared and was replaced by the Republican Party, founded in the 1850s, which has since remained one of the two dominant parties alongside the Democrats.
The U.S. political party system has seen significant shifts throughout its history and it has not remained stable since the founding of the country, making option a incorrect. Option c is also inaccurate because the party system has continued throughout modern times, with third parties and independent candidates playing varying roles. Option d mischaracterizes the relationship between the strength of the parties and the presidency, as the strength of political parties does not necessarily correlate with the power of the presidency.