Question

help!!!! the graph of g(x) shown below, resembles the graph of f(x) = x^4-x^2 but it has been changed somewhat. which could be the equation of g(x)???

a. g(x)=(x-0.5)^4 -(x-0.5)^2
b. g(x)=(x+0.5)^4-(x+0.5)^2
c. g(x)=x^4-x^2-0.5
d.x^4-x^2+0.5

I know its C or D but forget if when it goes up it is + or if its the opposite, -