To answer the query, let's analyze the given options step by step in the context of why not every purchase would show up on an account statement:
1. Option A: Some take time to clear.
2. Option B: Only purchases over $100 are included on your statement.
3. Option C: Your account statement only shows withdrawals, not purchases.
4. Option D: Your statement only includes suspicious purchases.
Based on this analysis, the most accurate answer to the query about why not every purchase would show up on your account statement is:
Answer: A. Some take time to clear.
This option correctly reflects the nature of transactional processing in banking where not all purchases appear immediately on your statement.