RALEIGH, N.C. — North Carolina remains steadfast in its belief that the NCAA is overreaching in its investigation of the school’s long-running academic fraud case. In a 102-page response to a third set of NCAA charges, North Carolina on Thursday once again challenged the NCAA’s jurisdiction to pursue charges for issues the school states “are academic in nature” and “lie beyond the reach of the bylaws belatedly invoked” by the NCAA.