The parent function given is \( f(x) = x^2 \).
To determine the graph that represents the function \( f(x + 3) \), we need to understand how the transformation works. The expression \( f(x + 3) \) represents a horizontal shift to the left by 3 units.
Since the vertex of the original parent function \( f(x) = x^2 \) is at (0, 0), shifting this vertex left by 3 units will move it to the point (-3, 0).
So the graph of \( f(x + 3) \) will be an upward opening parabola with its vertex at (-3, 0).
The correct answer, therefore, is:
C. On a coordinate plane, an upward opening parabola has a vertex at (negative 3, 0).