Do you not understand how to solve for the answer?
A would be the wavelength, C would be a crest, D would be the amplitude, leaving B which is the trough.
The answer would be A) TRUE because we as humans can be dehydrated easily just by working out in sun or working out in the cold winter, that's how our body burns fat and calories, but it also burns our eyes since sweat has salt in it, and dehydrated means to run out of water for us, like not enough water, but yes to the answer its T.