The maximum growth rate occurs in

By arc auxanometer,we measure the growth in

Which of the following movements is induced by injury?

The cells in this zone attain their maximal size in terms of wall thickening and protoplasmic modifications.

Assertion $(S)$: Growth occurs when anabolic processes exceed catabolic processes.
Reason $(R)$: Growth is the result of metabolism.
$(A)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(B)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(C)$ $S$ is true and $R$ is false.
$(D)$ $S$ is false and $R$ is true.

During the cell enlargement phase of growth,molecules of new cell wall material are inserted between the original molecules of the stretched wall. This process is known as: