Correct answer is B. 4/3 
Because if half a wall uses up 1/6 gallon of paint
A full wall uses 2/6 gallon of paint 
So multiple that 2 by 4 (the walls) and you get 8
So 8/6 —— then you need to simplify so divide the top and bottom by 2 and you get = 
4/3 gallons of paint