Assertion : The nearly tetrahedral arrangement of the orbitals about the oxygen atoms allows each water molecule to form hydrogen bonds with as many as four neighbouring water molecules.
Reason : In ice each water molecules forms four hydrogen bonds as each molecules is fixed in the space.

Options

A. If both the assertion and reason are true statement and reason is correct explanation of the assertion .
B. If both the assertion and reason are true statement but reason is not a correct explanation of the assertion .
C. If the assertion is true but the reason is a false statement.
D. If both assertion and reason are false statements.

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the nearly tetrahedral arrangement of orbitals around the oxygen atom in water allows each water molecule to form hydrogen bonds with up to four neighboring water molecules.
- Water (H₂O) has a bent molecular geometry due to the presence of two lone pairs on the oxygen atom, which leads to repulsion between the lone pairs and the bonding pairs.

2. **Analyzing the Geometry of Water**:
- Oxygen has six valence electrons. In water, it forms two covalent bonds with hydrogen atoms and has two lone pairs.
- The steric number (the total number of bonds and lone pairs) for water is 4 (2 bond pairs + 2 lone pairs).
- This gives a tetrahedral arrangement of electron pairs, but the actual shape of the molecule is bent due to lone pair-lone pair and lone pair-bond pair repulsions.

3. **Hydrogen Bonding in Water**:
- Oxygen is highly electronegative, which allows it to form hydrogen bonds with hydrogen atoms of neighboring water molecules.
- Each water molecule can form hydrogen bonds using its lone pairs with the hydrogen atoms of adjacent water molecules.

4. **Understanding the Reason**:
- The reason states that in ice, each water molecule forms four hydrogen bonds because the molecules are fixed in space.
- In solid ice, the water molecules are arranged in a stable lattice structure, allowing each water molecule to effectively form four hydrogen bonds with four neighboring water molecules.

5. **Conclusion**:
- Both the assertion and reason are true statements. The reason provided explains why the assertion is valid, as the tetrahedral arrangement of orbitals in water facilitates the formation of hydrogen bonds, especially in the solid state (ice).

### Final Answer:
Both the assertion and reason are true statements, and the reason is the correct explanation of the assertion.