citem

\usepackage{tikz}
\usetikzlibrary{quotes,angles,calc,patterns,tikzmark}
\pgfdeclarelayer{foreground}
\pgfsetlayers{main,foreground}
\newcommand*\bulat[1]{\tikz[baseline=(char.base)]{
            \node[shape=circle,draw,inner sep=2pt] (char) {#1};}}
\newcommand\citem{%
  \stepcounter{enumi}\item[\bulat{\Alph{enumi}}]}