Regarding use of the media, spin can best be defined as "B. casting a positive light on negative facts" although it should be noted that this can also mean casting negative light on positive facts.
Explanation:
Spin is casting a positive lightweight on negative facts.
In public relations and politics, spin may be a type of information, achieved through providing a biased interpretation of a happening or electioneering to steer belief in favor or against some organization or influential person.