The most common answer to this is D. it is a well-known fact that if in case you are stuck with nothing to eat and you are starving, you can eat leather shoes. Take note that the leather shoes in the past are made in a more natural manner. Right now, leather shoes contain tannins and they are not good for the body anymore.
If you are truly desperate and you need something to sustain your body, you are better off looking for some insects that you can eat. You can even eat ants if you do not have any choice as they are rich in protein. There are also some leaves that are edible if you are out in the wilderness.