Final answer:
The distinct feature of the Jacksonian party system was mass participation in elections (option d) , which marked the 1828 election of Andrew Jackson and the endorsement of more democratic practices.
Step-by-step explanation:
Jacksonian Party System and Mass Participation in Elections
The distinct feature of the Jacksonian party system was mass participation in elections. During the era of Andrew Jackson's presidency, the United States saw a significant shift in political practices, with an expanding electorate and the promotion of democracy. This period was defined by the transition from the first party system to the Second Party System, which was characterized by the emergence of the Democratic Party championing the common people against the elite, and the Whig Party supporting economic development and a strong federal government.
The 1828 election of Andrew Jackson as president marked a turning point, as voter turnout increased dramatically, and his victory was clearly supported by a broad coalition of urban workers, small northern farmers, and southern planters. This era signified the move towards a more inclusive democracy where political authority rested with a majority that now included a larger portion of the population.