The potential energy of a body is given by, $\mathrm{U}=\mathrm{A}-{\mathrm{Bx}}^2$ (Where x is the displacement). The magnitude of force acting on the particle is

• A

  Constant

• B

  Proportional to x

• C

  Proportional to ${\mathrm{x}}^2$

• D

  Inversely proportional to x