The quadratic functions f(x) and g(x) are described as follows: f(x) = -4x2 + 5

Which of the following statements best compares the maximum value of the two functions?

A: The maximum value is the same for both functions.
B: f(x) has a greater maximum value than g(x).
C: g(x) has a greater maximum value than f(x).
D: The maximum values cannot be determined.