Find the odd number / letters / word from the given alternative:

The odd one out is C, rain. The other three options, fog, cloud, and mist, are all forms of water vapor in the atmosphere. Rain is liquid water that falls to the ground from clouds.

Fog is a cloud that forms at ground level. It is made up of tiny water droplets that are so small they can float in the air.

Clouds are made up of tiny water droplets or ice crystals that are suspended in the atmosphere. They can be white, gray, or black, and they can take on many different shapes.

Mist is a type of fog that is very thin and light. It is often seen in the early morning or evening, when the air is cool and moist.