Answer:
A. To give more people a say in choosing candidates.
Step-by-step explanation:
The Jacksonian years saw a call to transform candidate nomination from a closed caucus exercise to a more democratic procedure. And it was precisely in the era of Andrew Jacskon that party conventions started, as he defined and presented himself as the peopleĀ“s president, the president of the common man. Also, the 1824 polemic and disputed election - "The Corrupt Bargain" - contributed to materializing the idea of party conventions. The practice started in 1832.