\(\frac{Area of the frame }{ area of the picture} = \frac{Area of the shaded part}{area of the UNshaded part }= \frac{Area of the square ABCD - Area of the square PQRS}{Area of the square PQRS}\)


Area of the square = \(\frac{1}{2} \times diagonal^2\)

and

Area of the square = \(side ^2\)


Area of square \(ABCD = x^2\)

Area of square \(PQRS = \frac{1}{2}x^2\)

\(\frac{Area of the frame}{area of the picture}\) \(= \dfrac{x^2-\frac{1}{2}x^2}{\frac{1}{2}x^2}=\frac{1}{1}\)

C is the answer