Which one of the following matrices is singular?

• A. \(\left[ {\begin{array}{*{20}{c}}2&5\\1&3\end{array}} \right]\)
• B. \(\left[ {\begin{array}{*{20}{c}}3&2\\2&3\end{array}} \right]\)
• C. \(\left[ {\begin{array}{*{20}{c}}2&4\\3&6\end{array}} \right]\)
• D. \(\left[ {\begin{array}{*{20}{c}}4&3\\6&2\end{array}} \right]\)