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

• A

  $\begin{array}{l|l|l|l} A & B & C & D \\ \hline 5 & 4 & 1 & 2 \end{array}$
• Correct answer
  B

  $\begin{array}{l|l|l|l} A & B & C & D \\ \hline 5 & 4 & 1 & 3 \end{array}$
• C

  $\begin{array}{l|l|l|l} A & B & C & D \\ \hline 4 & 2 & 3 & 1 \end{array}$
• D

  $\begin{array}{l|l|l|l} A & B & C & D \\ \hline 1 & 2 & 4 & 5 \end{array}$

Hence, the correct answer is option: 'B'.