Answer:
7/8 inch
Explanation:
13/16 inch = 0.8125 inch
1/2 inch = 0.5 inch
7/8 inch = 0.875 inch
3/4 inch = 0.75 inch
5/8 inch = 0.625 inch
7/8 inch is the only length that provides more than the length needed. Any of the other options would not have had enough wood.