%_Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then_%

• A. Their algebraic sum is zero
• B. Their lines of action are at equal distances
• C. The algebraic sum of their moments about any point in their plane is zero
• D. The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point