To determine the correct mirror image of a figure when a mirror is placed along a line, such as MN, follow these steps:

• Identify the axis of reflection; here, it is the line MN.
• Analyze the symmetry of the original figure concerning this line.
• Reflect each point of the figure over the line MN. This means for any point on the left of MN, its mirror image will be on the right at an equal distance and vice versa.
• Pictorial elements directly on the line MN will remain unchanged since they lie on the mirror axis.
• Compare each option with the deduced mirror image to choose the correct one.

Choose the option that aligns with this criteria to match the correct reflection. The correct mirror image of the figure is the first option provided: