Why is the water from ocean evaporation not salty?

Correct answer: Because only pure water molecules turn into gas during evaporation, leaving salts behind

Ocean water contains dissolved salts, but evaporation mainly removes water molecules from the surface. These molecules enter the atmosphere as water vapour, while the dissolved salts are non-volatile under ordinary natural conditions and remain in the ocean. When the vapour later cools and condenses, it forms droplets that are essentially fresh water. This separation is a natural part of the water cycle and helps produce freshwater precipitation.

Option B is correct. Wind can increase evaporation, and sunlight supplies energy, but neither is the reason that the vapour is not salty. The important reason is that dissolved salts do not normally pass into the vapour with water during evaporation. The original reference to boiling point gives a rough school-level idea, but the more accurate explanation is that salts are non-volatile and remain behind; boiling-point comparison alone should not be treated as the complete mechanism.