Solutions to multiple choice questions on single entry system, increased net worth method, and rent received.

Here are the solutions to all the multiple-choice questions:

(i) In single entry system:
In a single-entry system, the primary focus is on maintaining records for cash and personal accounts (debtors and creditors).
The correct answer is $\boxed{\text{A}}$

(ii) In increased net worth method, profit or loss is calculated by preparing:
The increased net worth method, also known as the statement of affairs method, calculates profit or loss by comparing the capital at the beginning and end of the period. This is typically presented in a Statement of profit or loss.
The correct answer is $\boxed{\text{C}}$

**(iii) If rent received during the year is Rs. 5000 and the amount of pre-received rent is Rs.