An object is thrown straight up. Which of the following is TRUE about the sign of work done by the gravitational force while the object moves up and down?

• A. Work is zero on the way up, work is zero on the way down.
• B. Work is negative on the way up, work is negative on the way down.
• C. Work is negative on the way up, work is positive on the way down.
• D. Work is positive in the way up, work is negative on the way down.