The circumference of a circle is measured as 56 cm with an error 0.02 cm. The percentage error in its area is

Question

$$\begin {array} {1 1} (a)\;\frac{1}{7} & \quad (b)\;\frac{1}{28} \\ (c)\;\frac{1}{14} & \quad (d)\;\frac{1}{56} \end {array}$$