Ans: option 'B' is correct because --
FOUR MAIN POINTS OF WORKING CAPITAL are –
(1).... CASH MANAGEMENT: Cash is one of the important components of CURRENT ASSETS.
(2)... RECEIVABLES MANAGEMENT: The term receivable is defined as any claim for money owed to the firm from customers arising from sale of goods or services in normal course of business.
(3).. INVENTORY MANAGEMENT:
(4).. ACCOUNTS PAYABLE MANAGEMENT:

Working Capital Requirement:
Working capital refers to the funds required for day-to-day operations of a business. It represents the difference between current assets and current liabilities. Current assets include cash, inventory, accounts receivable, and other assets that can be converted into cash within a year. Current liabilities include accounts payable, short-term debts, and other obligations that are due within a year.

Purchasing Current Assets:
When a business wants to expand its operations or meet the increasing demand for its products or services, it may need to purchase additional current assets. For example, if a retail store wants to increase its inventory to cater to higher customer demand, it may need to purchase more goods from suppliers. Similarly, if a manufacturing company wants to increase production, it may need to purchase raw materials or hire additional workers.

Funds Required:
To purchase these current assets, the business needs to allocate funds. These funds can come from various sources such as retained earnings, bank loans, or investors. However, the funds required for purchasing current assets are part of the working capital requirement. It is the amount of capital needed to cover the day-to-day operations and ensure smooth functioning of the business.

Importance of Working Capital:
Working capital is crucial for businesses as it helps them meet their short-term obligations, manage inventory, and cover operating expenses. It ensures that the business has enough liquidity to pay suppliers, employees, and other creditors on time. Insufficient working capital can lead to cash flow problems, delays in payments, and even business failure. Therefore, accurately estimating the working capital requirement is essential for the financial health and sustainability of the business.

Other Options:
The other options provided in the question are not applicable in the context of funds required for purchasing current assets.
- Ploughing back of profits refers to reinvesting the profits back into the business for further growth and expansion. While it can be used to finance various capital requirements, it is not specifically related to purchasing current assets.
- Fixed capital requirement refers to the funds needed for long-term investments in fixed assets such as land, buildings, machinery, etc. It does not directly relate to purchasing current assets.
- Lease financing refers to obtaining funds through leasing arrangements, where the business leases assets instead of purchasing them. It is not specifically related to working capital or current asset purchases.

Therefore, the correct answer is option B - Working capital requirement.