If we observe the graph of F(x) and G(x), F(x) can be obtained by shifting the graph of G(x) 4 units down.
Shifting 4 units down means subtracting 4 from the function value.
So, G(x) = 4 - x²
Thus,
F(x) = G(x) - 4
F(x) = 4 - x² - 4 = - x²
Therefore, the correct answer is option B