D. 100 kilometers cuz the more kilometers the better the altitude!!!
I would go with salt in ocean water as when you heat it and the water begins to evaporate it will leave the salt behind
Also water in mud as the water would evaporate and leave the mud residue behind
GOOD LUCK
BRAINLIEST IF HELPED
Hubble space telescope, Hubble deep field guide, moon, mercury, Saturn, sun, galaxy messier 101