Which of the following words is closest in meaning to “Precipitation”?

Precipitation means rain, snow or other water falling from the sky.

• Correct answer - fall of rain: it has the same meaning as Precipitation.
• slow reaction: a delayed response - wrong, it does not mean the same as Precipitation.
• evaporation: turning from liquid into vapour - wrong, it does not mean the same as Precipitation.
• humidity: moisture in the air - wrong, it does not mean the same as Precipitation.