Choose which statement describes a process in which an external force does negative work on the system. The person is not part of the system.
(a) A person slowly lifts a box from the floor to a tabletop.
(b) A person slowly lowers a box from a tabletop to the floor.
(c) A person carries a bag of groceries horizontally from one location to another.
(d) A person holds a heavy suitcase.
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