Final answer:
National party conventions significantly impact presidential campaigns by providing a platform for media exposure, party strategizing, and nominating candidates, often resulting in a post-convention surge in popularity for the candidate. The correct statement is A) Party conventions receive a great deal of national media attention.
Step-by-step explanation:
The impact of national party conventions on presidential campaigns is significant. These conventions receive extensive national media attention and act as a platform for the parties to formally adopt their national platform, strategize for their campaign, and present their nominated candidates. High-level politicians, party elites, and emerging leaders are given exposure to strengthen the party's image and rally support.
The speaking opportunities at such events, like the one Barack Obama capitalized on in 2004, can catapult politicians to national prominence. Moreover, the media coverage around the conventions creates a buzz in late summer when news stories may be scarce, providing the party and its nominees prominent visibility.
This exposure often translates into a post-convention 'bump' in the polls for the candidate, which can be critical for the election outcome.