Answer:
D. 114ft2
Explanation:
So i checked the question online and i believe the part "a scale where 12 inch corresponds to 6 feet" should be "a scale where 1/2 inch corresponds to 6 feet" 
In that case, a scale where 1/2 inch corresponds to 6 feet means 
scale = 1inch to 12 feet 
On the floor plan, Alexis' room is 1in by 1in 
-> in reality, alexis' room is 12ft by 12ft 
-> a scale where 1/2 inch corresponds to 6 feet