A Track Is Built Whose Height as a Function of Horizontal

Multiple Choice

A track is built whose height as a function of horizontal position x is given by (h and x,both in meters) .If a marble is placed on this track,find the position where it will be in a stable equilibrium.

A) 0.29 m
B) -0.29 m
C) 0.54 m
D) -0.54 m
E) 1.3 m