$1.$ The pizza market is divided as follows:

Pizza hut $20\mathrm{.}7\%$ Pizza Inn$/$Pantera$\text{'}$s $2\mathrm{.}2\%$

Domino's $17\mathrm{.}0\%$ Round table $2\mathrm{.}0\%$

Little Caesars $6\mathrm{.}7\%$ All others $51\mathrm{.}4\%$

$1.$A$.$ How would you describe its market structure?