Denoting work undertaken without charge, especially legal work for a client with a low income.

• A. Gratis
• B. Free of charge
• C. Unpaid
• D. Pro bono

Answer: (D)

In professional contexts, when a lawyer or other professional provides services at no charge to help someone who can’t afford them, that is described as pro bono. This term comes from Latin, meaning “for the public good,” and is the standard way to refer to free legal services offered to low-income clients as a matter of professional ethics and public service. It goes beyond simply being not paid, because it signals a deliberate charitable effort by a professional to give back to the community. General phrases like gratis or free of charge simply state that something costs nothing, without the professional, public-spirited dimension. Unpaid means not receiving payment, but it doesn’t convey the organized, service-for-the-public good aspect that pro bono does.