Why the answer is B, and why the others tempt you.
**The reasoning**
A trial balance is a statement that lists **all the closing balances from every account in the ledger** at a specific date. Think of it as a "roll call" for all your accounts—Assets, Liabilities, Capital, Revenue, and Expenses.
Here's the flow: You record transactions in journals → Post them to individual ledger accounts → Extract the balances from these ledger accounts → List them in the trial balance to check if Total Debits = Total Credits.
So the **source document** for preparing a trial balance is always the **ledger**, where all accounts live.
**Why the wrong options tempt you**
- **A (Income statement)**: This is actually *prepared FROM* the trial balance, not the other way around. It's a final statement showing profit/loss.
- **C (Cash book)**: This is just ONE book of original entry. The trial balance needs balances from ALL accounts, not just cash.
- **D (Bank statement)**: This comes from your bank, used for reconciliation—not for preparing trial balances.
**Quick takeaway**
Trial balance = Summary of **ledger balances**—it's the checkpoint before you prepare your financial statements.
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