Deaconess, this is the solution:
If Mr. Dudzic is planning to paint just the walls of his living room, therefore:
• He won't need to know the volume of the rectangular prism
,
• He won't need to know the perimeter of the room
,
• He won't need to know the surface area of the entire room, including ceiling and floor
,
• He just need to know beforehand the surface area of the walls
Correct answer D.