Answer: the correct option is
(D) point A' is the same as point A.
Step-by-step explanation: Given that a point A lies on the line of reflection.
We are to find the position where the reflected image point A' lie.
Let X axis be the line of reflection and (a, 0) is a point on the line X axis.
We are to check where the image of (a, 0) will lie.
We know that
any point (x, y), if reflected across X axis, its image will have co-ordinates (x, -y).
So, the image of the point (a, 0) will be (a, 0).
Therefore, the image of the point on the line of reflection is the point itself.
Thus, the point A' is the same as point A.
The line of reflection (X-axis), the point (3, 0) and its reflected point (3, 0) are shown in the attached figure below.
Option (D) is CORRECT.