Assertion (A): Most of the solids possess high melting point.
Reason (R): They have strong intermolecular forces of attraction.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is True

Explanation

To solve the assertion and reason question, we need to analyze both statements and determine their validity and relationship.

### Step 1: Analyze the Assertion (A)
**Assertion (A): Most of the solids possess high melting point.**

- **Explanation**: Solids are generally characterized by their fixed shape and volume. The melting point of a solid is the temperature at which it transitions to a liquid state. Most solids, especially crystalline solids, have high melting points due to the strong forces holding their particles together.

### Step 2: Analyze the Reason (R)
**Reason (R): They have strong intermolecular forces of attraction.**

- **Explanation**: The melting point of a solid is significantly influenced by the type and strength of the forces between its particles. Solids with strong intermolecular forces (like ionic bonds, covalent bonds, or metallic bonds) require more energy (in the form of heat) to overcome these forces, resulting in higher melting points.

### Step 3: Determine the Relationship Between A and R
- Both the assertion and the reason are correct. The reason provided explains why the assertion is true. The strong intermolecular forces of attraction in solids lead to higher melting points.

### Conclusion
Since both the assertion and reason are correct, and the reason correctly explains the assertion, we conclude that:

**Answer**: Both A and R are true, and R is the correct explanation of A.