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The average human ear can not distinguish the variation of intensity

1. if the variation is more than 100 times
2. if the variation is more than 16 times
3. if the variation is less than 16 times
4. if the variation is zero

Correct answer: if the variation is less than 16 times

Solution

The ear does not perceive very small intensity differences as distinct unless the change is large enough. A variation smaller than about 16 times is below the level the average ear can reliably distinguish, so that is the correct choice.

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