The correct answer is the first option, which states that the money market is the organized exchange on which participants can lend and borrow large sums of money for profit for a period of one year or less. This option accurately describes the main characteristics and purpose of the money market, which is a financial market where short-term borrowing and lending of funds takes place. Participants in the money market include banks, financial institutions, corporations, and governments, who engage in transactions to meet their short-term funding needs.