\documentclass{jarticle}
\usepackage[dvipdfmx]{emathP}
\usepackage{emathZ}
\setlength{\columnsep}{2zw}
\setlength{\columnseprule}{0.1pt}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newif\ifkaitou%  追加
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\kaitoutrue%    どちらかをコメントとする
%\kaitoufalse%   どちらかをコメントとする
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\twocolumn
%
\begin{enumerate}[\bfseries 【1】]
%
\item        \begin{enumerate}[(1)]
        \item {\ifkaitou\color{red}\else\color{white}\fi
                \begin{zyukeizu}%
                \eda{ \maru{1}%
                        \begin{zyukeizu}%
                        \eda{ 2}%
                        \eda{ 3}%
                        \eda{ 4}%
                        \end{zyukeizu}%
                        }%
                \eda{ 2 %
                        \begin{zyukeizu}%
                        \eda{ \maru{1}}%
                        \eda{ 3}%
                        \eda{ 4}%
                        \end{zyukeizu}%
                        }%
                \eda{ 3 %
                        \begin{zyukeizu}%
                        \eda{ \maru{1}}%
                        \eda{ 2}%
                        \eda{ 4}%
                        \end{zyukeizu}%
                        }%
                \eda{ 4 %
                        \begin{zyukeizu}%
                        \eda{ \maru{1}}%
                        \eda{ 2}%
                        \eda{ 3}%
                        \end{zyukeizu}%
                        }%
                \end{zyukeizu}%
                }
                \vspace{2mm}
        \item \ifkaitou\textcolor{red}{$\bm{\bunsuu{1}{2}}$}%
                  \else\textcolor{white}{$\bm{\bunsuu{1}{2}}$}\fi
        \end{enumerate}
        \vspace{2mm}
%
\end{enumerate}
%
\end{document}

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