What are the reasons that add up to incumbency advantage?

For most political offices, the incumbent often has more name recognition due to their previous work in the office. Incumbents also have easier access to campaign finance, as well as government resources (such as the franking privilege) that can be indirectly used to boost the incumbent's re-election campaign.

Explanation:

In general, an incumbent has a political advantage over challengers at elections. ... Incumbents also have easier access to campaign finance, as well as government resources (such as the franking privilege) that can be indirectly used to boost the incumbent's re-election campaign.

C) the idea that the plans are reuniting the nation without resolving the fundamental conflicts at the root of the division between North and South