Final answer:
The transformation g(x) = f(x + 3) causes a horizontal shift of the function f(x) to the right by 3 units, making option A the correct answer.
Step-by-step explanation:
The transformation g(x) = f(x + 3) represents a horizontal shift of the original function f(x) to the right by 3 units. When you add a positive constant inside the function's argument, you shift the graph horizontally in the opposite direction of the sign; in this case, since we add 3, we move horizontally to the right side of the coordinate system. Therefore, the correct answer is A) A horizontal shift of f(x) to the right by 3 units. This is because the transformation does not affect the y-values, but instead, it moves every point on the graph of f(x) to the right by 3 units along the x-axis. This type of transformation neither reflects the function over an axis nor affects its vertical position.