The correct answer is A. Capital.
Capital is the money or other assets that are invested in a business to start it up and keep it running. It can come from a variety of sources, such as personal savings, loans from banks or other financial institutions, or investments from individuals or companies.
Funds are a general term for money or other assets that are available for use. They can be used for a variety of purposes, such as investing, starting a business, or paying for expenses.
Assets are items of value that a company owns. They can be tangible, such as property or equipment, or intangible, such as patents or trademarks.
Liabilities are debts that a company owes. They can be short-term, such as accounts payable, or long-term, such as bonds.
In the context of the question, capital is the most appropriate term to use because it refers specifically to the money or other assets that are used to start and operate a business.