To reflect the function \( f(x) = (x + 1)^2 \) over the x-axis, we need to multiply the entire function by -1. This transformation changes the sign of the output values of the function.
Therefore, the reflected function \( g(x) \) will be:
\[ g(x) = -(x + 1)^2 \]
Among the response options, this corresponds to:
\[ g(x) = - (x + 1)^2 \]
So, the correct answer is:
g(x) = −(x + 1)².