Answer:
It will not unless it contains as much energy as the cup of tea. So a tiny spark may be at 1,000 Celsius but a whole cup of tea at 90 Celsius will deliver far more heat (energy) to the skin as the spark.
Water is H2O so that's Hydrogen and Oxygen.
B. specific to a substrate
I would say C because our body is continuously changing through puberty. We need more sleep, more food consumption, we need to have fantastic hygiene, etc...
Https://www.ncbi.nlm.nih.gov/pubmed/8300084
This might help