I think it would be B. I think this because while tennis shoes aren’t exactly bad and won’t mess with anything in an operating room it is also a possibility that blood and other organic material would get in his shoes which would be considered a bio-hazard. The shoes coverings would also be the safest bet because while the shoes might be water resistant (blood resistant ig) there is still the possibility that it would get through the gap in between the ankle and the shoe.
Hope this helps.