I am pretty sure it is something related to space
I'm not completely sure, but I'm fairly certain that the answer is B.
Answer:
Cellular Respiration occurs when cells use oxygen to produce energy from food you eat.
Graphite is well known to be pencil lead - You might actually learn this in Chemistry/Physical Science like we did!
Charcoal & coal you cannot use - you could but it'd be difficult and irritating.
Fullerene is the third form of carbon. It can be used for electronics AND medicine. Amazing right??