Answer:
B. g(x)
Step-by-step explanation:
g(x) is a function of odd degree, so its minimum value is -∞, which is far less than the minimum value of -2 that f(x) has.
_____
Any even-degree term (with a positive coefficient) will have a minimum value of zero, hence the minimum value of f(x) is the constant added to the 4th degree term.
