4. The potential energy of a body of mass m is given by U = -Ax + Bx². The corresponding conservative force is:
(A) A-2Bx
(B) –A+ 2Bx
(C) Ax²/2 -Bx³/3
(D) -Ax²/2 + Bx³/3
(E) It's not a consevative force.

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