B 2. The reality: Instruction oriented to using
You better refuse to give evidence! Either your correct explanation will be long lasting boring to your listeners or you can make a scrap statement using the words: constant current source, thermal dependent resistor, analog-digital converter, nematic liquid crystals, elliptic polarized light... Shut up!! Maybe it's right, but useless.
So you will say: "Leave that aside. Now we take this thermometer to get the temperature of our experiment the most convenient way - or would you prefer that 'old' mercury thermometer?" That is the 'pragmatic' answer.
move on