The correct answer is option 'B', which is to debit the amount of Rs. 1,000 spent on repairing old furniture to the Furniture account. Let's understand why this is the correct choice.

Explanation:
1. Debit and Credit: In accounting, we use the terms "debit" and "credit" to record transactions. Debit refers to an increase in an asset or expense account, while credit refers to an increase in a liability, equity, or revenue account.

2. Repair Expense: The amount of Rs. 1,000 spent on repairing the old furniture is considered a repair expense. Repair expenses are recorded as an expense account because they are costs incurred to restore the functionality or appearance of an asset.

3. Furniture Account: The Furniture account is an asset account that represents the value of furniture owned by a business. When the old furniture is purchased, the cost of acquisition is recorded as a debit to the Furniture account.

4. Matching Principle: The matching principle in accounting states that expenses should be recorded in the same accounting period as the revenues they help generate. In this case, the repair expense of Rs. 1,000 is directly related to the old furniture and should be matched with the value of the furniture in the accounting records.

5. Debiting the Furniture Account: By debiting the Furniture account with the repair expense of Rs. 1,000, we are increasing the value of the furniture to reflect the additional cost incurred in repairing it. This ensures that the expense is matched with the asset in the accounting records.

6. Other Options: The Repair account (option 'A') would be used if the business maintains a separate account specifically for recording repair expenses. However, in this case, the repair expense can be directly debited to the Furniture account.

Conclusion:
In conclusion, when Rs. 1,000 is spent on repairing old furniture, the amount should be debited to the Furniture account. This ensures that the repair expense is matched with the asset value in the accounting records, following the principles of debit and credit.