A particle with total energy E in Potential energy region U(x).Motion of the particle is restricted to the region when ? check description

Question

A particle with total energy E in Potential energy region U(x).Motion of the particle is restricted to the region when 

options are

(a) U(x)>E

(b) U(x)<E

(c) U(x)=0

(d) U(x) < or = E

Answer 1

Total Energy = Potential Energy + Kinetic Energy

E = U(x) + KE(x)

or E - U(x) = KE(x)

If the particle is moving, kinetic enegy must be positive or KE(x) >0 

then E - U(x) = KE(x) > 0

E > U(x) or U(x) < E or choice b