Riddle

I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?

Choose an answer

A.Water
B.Sunlight
C.Silence
D.Air
Hint: It's a word with 3 letters, starting with "A".

Answer

Air

Why this is the answer

Air surrounds us constantly and goes unnoticed, is usually fresh and clean, but can sometimes smell foul or 'rotten.'

This riddle is filed under "What Am I?" Riddles and rated Medium.