Introduction:
The shrinkage or contraction of a plant cell is a result of osmosis, which is the movement of water across a semi-permeable membrane from an area of higher water concentration to an area of lower water concentration. The direction of water movement is determined by the relative concentrations of solutes on either side of the membrane. In this case, we are considering the effect of different types of solutions on a plant cell and how it impacts its size.

Hypotonic Solution:
- In a hypotonic solution, the concentration of solutes outside the cell is lower than the concentration inside the cell.
- As a result, water moves into the cell in an attempt to equalize the concentration on both sides of the membrane.
- The influx of water causes the cell to expand and become turgid.
- This is the ideal condition for plant cells, as it provides structural support and maintains cell shape.

Isotonic Solution:
- In an isotonic solution, the concentration of solutes outside the cell is equal to the concentration inside the cell.
- There is no net movement of water, and the cell maintains its size and shape.
- This is an equilibrium condition where the cell is neither gaining nor losing water.

Hypertonic Solution:
- In a hypertonic solution, the concentration of solutes outside the cell is higher than the concentration inside the cell.
- Water moves out of the cell, causing it to lose water and shrink.
- The cell becomes flaccid and may undergo plasmolysis, where the plasma membrane pulls away from the cell wall.

Pure Water:
- Pure water is hypotonic to a plant cell.
- Due to the absence of solutes in pure water, water molecules move into the cell in an attempt to equalize the concentration.
- The influx of water causes the cell to expand and become turgid, which is the ideal condition for plant cells.

Conclusion:
From the given options, the correct answer is option B - a hypertonic solution. In a hypertonic solution, the higher concentration of solutes outside the cell causes water to move out of the cell, resulting in shrinkage or contraction of the plant cell. This is in contrast to a hypotonic solution, isotonic solution, or pure water, where the cell either gains water and becomes turgid or maintains its size and shape.