B. 83.5 inches squared
Explanation:
The area of the remaining sheet of paper can be calculated by subtracting the area of the cut-off corner from the total area of the original sheet.
Total area of original sheet = 11 inches * 8.5 inches = 93.5 inches squared
Area of cut-off corner = 6 inches * 6.5 inches = 39 inches squared
Remaining area = 93.5 inches squared - 39 inches squared = 54.5 inches squared
Therefore, the area of the remaining sheet of paper is 83.5 inches squared.