Relative to Their Size, Pollen Tube Cells Are Extremely Large

Relative to their size, pollen tube cells are extremely large. How do such very large cells keep the necessary organelles and nutrients concentrated at the growing tip?

A) By producing very high numbers of all the required organelles and nutrients, such that there are a high concentration throughout the cell at all positions.
B) Pollen tubes typically grow down, therefore the required organelles and nutrients simply accumulate at the growing tube via gravity.
C) By depositing membranous plugs behind the extending tip, thereby concentrating the required organelles and nutrients at the growing tip.
D) By depositing lignified plugs behind the extending tip, thereby concentrating the required organelles and nutrients at the growing tip.
E) By depositing callose plugs behind the extending tip, thereby concentrating the required organelles and nutrients at the growing tip.