Which of the following shows correct chronological order of the events occurring during callus culture?

• A

  Callus $\rightarrow$ Cell division $\rightarrow$ Explant $\rightarrow$ Addition of cytokinin $\rightarrow$ Cells acquire merstematic property

• B

  Explant $\rightarrow$ Callus $\rightarrow$ Cell division $\rightarrow$ Addition of cytokinin $\rightarrow$ Cells acquire meristematic property

• C

  Explants $\rightarrow$ Cell division $\rightarrow$ Callus $\rightarrow$ Addition of cytokinin $\rightarrow$ Cells acquire meristematic property

• D

  Callus $\rightarrow$ Explant $\rightarrow$ Cell division $\rightarrow$ Addition of cytokinin $\rightarrow$ Cells acquire meristematic property