I would not consider C to be a proper definition of the word. It is too vague. What is meant by conscious existence? Of all the creatures we are aware of , only humans are known, for certain, by us to have awareness of their own existence so only humans would be beings if that were what was meant by the definition conscious existence. We would not need the adjective Human in the phrase Human Being and we would be guilty of redundancy to use it if that were a correct definition. So on that point we probably agree. However, I would include the idea of a conscious living individual and not just an existent thing like a rock or a piece of bread as qualifying as a being. A dog, or cat, or bear, or tree and a fetus are from my perspective beings with an individual existence though not necessarily conscious of their own existence yet conscious of the world around them as evidenced by their responding to stimuli which is missing in the rock or the piece of bread.
I'm going to guess that we differ in that you seem to consider a fetus conscious while I do not until latter in it's development (around 24 -26 weeks I believe).
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