It's not A.Because the lower in the atmosphere your in the denser it is the higher the less dens.B.Is right because the higher in altitude the hotter it get's until your past the halo around earth's atmosphere also the ozone.C.Is correct because lower altitude has higher air pressure and contains the most water molecules.B.Is not correct because as i stated before the more altitude the less dens it get's but it dose get hotter the higher you go. ;) :)