Why was the spoil system created?

AJackson wanted to employ well-qualified advisors based on merit.
BJackson felt it was necessary to reward party followers to enhance his power.
CJackson appointed political rivals to create a balance in government jobs.
DIt was the system created to reward or "spoil" representatives who voted for Jackson's policies.

In governments and politics, a spoils system is a system in which a political group, after succeeding a poll, provides state civil service positions to its followers, colleagues, and relations as a bonus for serving toward triumph, and as an impetus to continue serving for the political party—as exposed to a merit system, in which the offices are bestowed on the grounds of some standard of merit. Though the extensive range of this political behavior has its source in the practice of political clientelism, the appearance "spoils system" does not mean a contradictory essence, that is to say, that such division of statuses is undoubtedly offensive. In different terms, it is a purely unbiased expression that represents a formally accepted and fully implemented system.