(A) if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

(B) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

(C) if a polygon representing forces acting at a point is closed then forces are in equilibrium

(D) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

(E) none of the above.