Thoracic Cross Section Reference
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I had no clue where the damage was either, but with that said:
You feel the grass with your feet ––> gracilus
And the arrangement along the spinal cord is similar to the sensory/motor homunculus of the brain where the feet are on the inside/medial and the arms are on the outside/lateral.
This is showing demylination/disruption (presumably from the spinal cord injury) of the fasciculus gracilis at the level of the lower thoracic cord. You can tell this is the thoracic cord because of the presence of the intermediate horn and the smaller ventral horns. It is the lower thoracic cord (below T5) because there is only one dorsal column.
We have only enough information to conclude lower leg involvement so loss of sensation to vibration over both feet is the best answer.
check this link out, here the picture is very clear.
Check out FA2020 pg 508 Put simply--> myelin= black --> color of the normal white matter no myelin= pink --> color of the normal gray matter and the damaged area
Dorsal columns= vibration, proprioception, pressure fine touch F. graciLis= Lower body F. cUtaneous= Upper body