Assertion: Be is readily attacked by acids.
Reason: Be shows diagonal relationship to Na.

Options

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

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Be is readily attacked by acids."
- Beryllium (Be) is known to form a protective oxide layer (BeO) on its surface. This oxide layer makes beryllium relatively resistant to acids. Therefore, the assertion is **false**.

2. **Understanding the Reason**:
- The reason states that "Be shows diagonal relationship to Na."
- A diagonal relationship in the periodic table typically refers to similarities between elements that are not in the same group but are close to each other diagonally. Beryllium (Be) is in group 2 and sodium (Na) is in group 1. However, beryllium actually shows a diagonal relationship with aluminum (Al), not sodium. Therefore, the reason is also **false**.

3. **Conclusion**:
- Since both the assertion and the reason are false, the correct answer is that neither the assertion nor the reason is true.

### Final Answer:
Both the assertion and the reason are false.