Why are symmetry arguments especially useful before evaluating Coulomb-force integrals for continuous charge distributions?

• A. They guarantee the electric force magnitude is constant across the distribution
• B. They allow every continuous distribution to be replaced by a point charge exactly
• C. They eliminate the need to define the geometry and the distance $R$
• D. They identify components that cancel, reducing the integral to only the nonzero direction

Answer: (D)