Match the following columns and choose the correct option.
$\begin{array}{|l|l|l|}
\hline & \text{Column I} & \text{Column II} \\
\hline A. & \text{Mutation breeding} & \begin{array}{l}
\text{1. Laborious and expensive} \\
\text{process to obtain gene} \\
\text{variation}
\end{array} \\
\hline B. & \text{Selection} & \begin{array}{l}
\text{2. Hybrid vigour can be} \\
\text{maintained for several} \\
\text{generations}
\end{array} \\
\hline C. & \text{Hybridisation} & \begin{array}{l}
\text{3. Simplest and easiest} \\
\text{method of plant} \\
\text{improvement}
\end{array} \\
\hline D. & \text{Introduction} & \text{4. Oldest breeding method} \\
\hline & & \begin{array}{l}
\text{5. Quick method to obtain} \\
\text{gene variation}
\end{array} \\
\hline
\end{array}$