Microscale could be best bet as evaboration and other factors can come in play. otherwise contact angle measurements could have something related calculated via surface tension.
something that is possible, calculating mols via gravimetry.
finding the suitable material could be tricky as if it needs to be instant. silica gel doesn't necessarily work
adsorption vs. absorption
I think it’s most likely a, but it could be D :)
I think this is how you do it:
Answer: nucleus
Explanation: the bigger the nucleus there more reactive the atom is