$[$Alligator$]$ Currently, $0\mathrm{.}5\%$ of U$.$S households have an alligator as a pet. In contrast, $10\mathrm{.}3\%$ of Gainesville households have an alligator as a pet. What is the index for Gainesville for alligator as a pet?A$)20\mathrm{.}6$B$)2,060$C$)48$D$)20$E$)4\mathrm{.}85$