C. A three-foot submarine sandwich is cut into eight equal portions.
3/8 represents 3 divided by 8. In scenario C, the sub starts at 3 feet and is cut (or divided) into 8 pieces. This represents 3 divided by 8, as shown by the fraction 3/8.
The other scenarios all show 8 divided by 3, which would be the fraction 8/3, which is not what we are looking for.