The figure number D in the option will be symmetrical because its shape is same from both sides to the reference line.
What is symmetry?
Something is symmetrical when it is the same on both sides. A shape has symmetry if a central dividing line (a mirror line) can be drawn on it, to show that both sides of the shape are exactly the same.
So the figure number D in the option will be symmetrical because its shape is same from both sides to the reference line.
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