I think b makes the most sense. The press would have most likely helped many Protestants share their works easier, such as Martin Luther with the 95 theses.
The American Revolution was principally caused by colonial opposition to British attempts to impose greater control over the colonies and to make them repay the crown for its defense of them during the French and Indian War (1754–63). ... Read more about the causes of the American Revolution in the United States article
Basically it's a key to candidates because it is considered to influence the overall result of the president election. Democratic and Republicans both have a good chance to gain a win.
