Problem with Multicolumn and Multirow table

Question

I have a problem in my multirow and multicolumn table. As you can see in the figure, there is an extra horizontal line over the first column. Can anybody tell me how to remove it. I constructed the entire table with the help of articles given in Latex WikiBooks.

This is my code:

\documentclass[letterpaper, 10 pt, conference]{ieeeconf}  
\IEEEoverridecommandlockouts                              
\overrideIEEEmargins      
\usepackage{multirow}

\begin{document}

\maketitle
\thispagestyle{empty}
\pagestyle{empty}
%-----------------------------------------------%
\begin{table}[!t]   \label{table:accuracy}
\centering
\caption{Title.}
\begin{tabular}{| c | c | c | c | c |} \cline{1-4}

& \multicolumn{3}{ c| }{A} \\
\hline 

\multicolumn{1}{|p{1cm}|}{\centering A= \\ $[B,C]$} & \multirow{2}{*}{C} & \multirow{2} {*}{D} & \multicolumn{1}{|p{1.5cm}|}{\centering E+ \\ F} & \multicolumn{1}{|p{1.8cm}|} {\centering G+\\+H+I}  \\  
\hline \hline 
$[4,1]$        &    30.22\%  &   46.67\%  &  44.27\%  &  30.48\%   \\
$[4,2]$      &    76.94\%  &   73.27\%  &  80.03\%  &  38.47\%   \\         
$[4,3]$      &    55.22\%  &   68.75\%  &  71.66\%  &  57.29\%   \\         
$[4,4]$      &    98.98\%  &   79.52\%  &  82.59\%  &  21.84\%   \\
$[5,2]$      &    36.94\%  &   56.48\%  &  63.25\%  &  47.40\%   \\     
$[5,3]$      &    63.99\%  &   53.30\%  &  51.70\%  &  59.32\%   \\         
$[5,4]$      &    46.46\%  &   39.06\%  &  39.94\%  &  59.91\%   \\         
$[6,4]$      &    96.80\%  &   96.80\%  &  100\%    &  98.17\%     \\
\hline
\multicolumn{1}{|p{1cm}|}{\centering R \\ S}  &  \multirow{2}{*}{56.37\%} &  \multirow{2}{*}{58.33\%} &  \multirow{2}{*}{\textbf{60.15\%}}  &  \multirow{2}{*}{\textbf{51.76\%}} \\     
\hline
\end{tabular}
\end{table}

\end{document}

The top figure shows how it is currently, and how I would like it to be:

Answer 1

You had the column count incorrect in you \cline (also don't use \label before \caption. I used the standard article as I didn't hav ethe conference class you are using

\documentclass[letterpaper, 10 pt, conference]{article}  

\usepackage{multirow}

\begin{document}


\thispagestyle{empty}
\pagestyle{empty}
%-----------------------------------------------%
\begin{table}
\centering
\caption{Title.}\label{table:accuracy}
\smallskip
\begin{tabular}{| c | c | c | c | c |} \cline{2-4}

\multicolumn{1}{c|}{}
& \multicolumn{3}{ c| }{A} \\
\hline 

\multicolumn{1}{|p{1cm}|}{\centering A= \\ $[B,C]$} & \multirow{2}{*}{C} & \multirow{2} {*}{D} & \multicolumn{1}{|p{1.5cm}|}{\centering E+ \\ F} & \multicolumn{1}{|p{1.8cm}|} {\centering G+\\+H+I}  \\  
\hline \hline 
$[4,1]$        &    30.22\%  &   46.67\%  &  44.27\%  &  30.48\%   \\
$[4,2]$      &    76.94\%  &   73.27\%  &  80.03\%  &  38.47\%   \\         
$[4,3]$      &    55.22\%  &   68.75\%  &  71.66\%  &  57.29\%   \\         
$[4,4]$      &    98.98\%  &   79.52\%  &  82.59\%  &  21.84\%   \\
$[5,2]$      &    36.94\%  &   56.48\%  &  63.25\%  &  47.40\%   \\     
$[5,3]$      &    63.99\%  &   53.30\%  &  51.70\%  &  59.32\%   \\         
$[5,4]$      &    46.46\%  &   39.06\%  &  39.94\%  &  59.91\%   \\         
$[6,4]$      &    96.80\%  &   96.80\%  &  100\%    &  98.17\%     \\
\hline
\multicolumn{1}{|p{1cm}|}{\centering R \\ S}  &  \multirow{2}{*}{56.37\%} &  \multirow{2}{*}{58.33\%} &  \multirow{2}{*}{\textbf{60.15\%}}  &  \multirow{2}{*}{\textbf{51.76\%}} \\     
\hline
\end{tabular}
\end{table}

\end{document}