Answer:
I do not know which substance you are referring to, but the freezing point of water is 32°F, or 0°C.
I'm pretty sure that it's 815.
Based on the law of conservation of energy, we know that we can't create energy, machines can only convert one type of energy into another. So, if we want to improve a machines's ability then we need to reduce it's loss energy (part of energy which is useless). Out of all the options only Option C fits best with it.
In short, Your Answer would be Option C
Hope this helps!
