Explanation:
The phase of elongation is one of the stages of cell growth and development in plants. During this phase, cells undergo several changes to increase in size and prepare for differentiation. However, not all characteristics mentioned in the options are associated with the phase of elongation.

Increased vacuolation:
- Vacuoles are membrane-bound organelles found in plant cells that play various roles such as storage of water, ions, and metabolites.
- During the phase of elongation, the vacuoles within the cells become larger, leading to increased vacuolation.
- This allows the cell to expand and elongate as water and solutes are taken up by the vacuole, exerting turgor pressure on the cell wall.

Plasmodesmatal connections:
- Plasmodesmata are small channels that traverse the cell walls of plant cells, allowing for communication and transport of molecules between adjacent cells.
- Plasmodesmata are essential for various cellular processes, including nutrient exchange, signaling, and movement of macromolecules.
- During the phase of elongation, plasmodesmatal connections are maintained and even increased to facilitate communication and signaling between neighboring cells.

Cell enlargement:
- Cell enlargement is a key characteristic of the phase of elongation.
- During this phase, cells increase in size as they accumulate water and solutes in the vacuole, leading to turgor pressure and expansion of the cell wall.
- The expansion of the cell wall allows the cell to elongate and contribute to overall plant growth.

Cell wall deposition:
- Cell wall deposition is another important characteristic of the phase of elongation.
- As the cell enlarges, it synthesizes and deposits new cell wall material to maintain its structural integrity and provide support.
- The newly synthesized cell wall material is laid down between the existing cell wall and the plasma membrane, contributing to cell elongation.

Conclusion:
In conclusion, the characteristic that is not associated with the phase of elongation is plasmodesmatal connections (option B). During this phase, cells undergo increased vacuolation, cell enlargement, and cell wall deposition to support elongation and growth. Plasmodesmata, on the other hand, are maintained and increased in number to facilitate communication and transport between adjacent cells.