Correct Option: C

occupy (Verb) : to fill or use a space, an area or an amount of time ; take up ; to live or work in a room, house or building
vacate (Verb) : to empty; to leave a building, seat, job. position of authority etc.
evacuate (Verb) : to move people from a place of danger to a safer place
validate (Verb) : to prove that something is true; to make something legally valid ; to state officially that something is useful and of an acceptable standard
empty (Verb) : to evacuate ; to remove everything from a container