How does the addition of salt to solid ice affect the boiling transition from to liquid to gas? a. the plateau would be longer because the salt would lower the vapor pressure, making it more difficult to boil. b. the plateau would be longer because the salt would raise the vapor pressure, making it more difficult to boil. c. the plateau would be shorter because the salt would raise the vapor pressure, making it easier to boil. d. the plateau would be shorter because the salt would lower the vapor pressure, making it easier to boil.