d
$\omega_{1}=100 \mathrm{rad} \mathrm{s}^{-1} ; \omega_{2}=1000 \mathrm{rad} \mathrm{s}^{-1}$
Maximum acceleration of $(1)=-\omega_{1}^{2} A$
Maximum acceleration of $(2)=-\omega_{2}^{2} A$
$\therefore \frac{\operatorname{accln}(1)}{\operatorname{accln}(2)}=\frac{\omega_{1}^{2}}{\omega_{2}^{2}}=\frac{(100)^{2}}{(1000)^{2}}=\frac{1}{100}$
$a(1): a(2)=1: 100$.