A 020-Kg Particle Moves Along the X Axis Under the Influence

A 0.20-kg particle moves along the x axis under the influence of a stationary object. The potential energy is given by U(x) = (8.0J/m²) x² + (2.0J/m⁴) x⁴,
Where x is in coordinate of the particle. If the particle has a speed of 5.0 m/s when it is at x = 1.0 m, its speed when it is at the origin is:

A) 0
B) 2.5 m/s
C) 5.7 m/s
D) 7.9 m/s
E) 11 m/s