4. A rigid body rotates about a fixed axis with an angular velocity ω. The body consists of two particles, each of mass m, at distances r₁ and r₂ from the axis. What is the total kinetic energy of the system? (A) (B) ½m(ωr₁)² + ½m(ωr₂)² (C) (D)(E) mω(r₁ + r₂)