c
\(\begin{array}{l}
Area\,of\,the\,sphere,\,A = 4\pi {r^2}\\
\% \,error\,in\,area\, = 2 \times \% \,error\,in\,radius\\
i.e,\,\frac{{\Delta A}}{A} \times 100 = 2 \times \frac{{\Delta r}}{r} \times 100\\
 = 2 \times 0.3\%  = 0.6\% \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,But\frac{{\Delta A}}{A} = 4\frac{{\Delta r}}{r}\,is\,false.
\end{array}\)