The correct answer is: D) nullification.
Jefferson's Kentucky Resolution (drafted in 1798) introduces the theory of nullification. This means that states, individually, can judge a central government law and declare it unconstitutional if they desire to do so.
Conflict. It is no longer fun for her because she cannot beat him, which causes a conflict with her wanting to win
The right answer for the question that is being asked and shown above is that: "d. A piece may only move into an unoccupied square." a rule in checkers is that d. A piece may only move into an unoccupied square.