One May Correctly Say of the Concert of Europe That

One may correctly say of the Concert of Europe that

A) its members always agreed with the actions of the alliance.
B) it was another name for the Quadruple (or Quintuple) Alliance.
C) it was willing to threaten, but not to act.
D) it successfully prohibited all movements for national independence in the 1820s.
E) France was never accepted as a member.