Answer:
Option (C).
Step-by-step explanation:
Apical meristem can be defined as the region having rapidly growing cells, at tips of plant shoot and roots.
It is responsible for primary growth of plant shoots and roots as division in cells of this region results in increase in length of plant shoot and roots.
This is because cells present in this region are actively involved in growth by undergoing mitotic cell division.
Thus, the correct answer is option C.