How does blowing inside the bottle make the paper ball come out ?

Air pressure near the mouth of the bottle rises and reduced air pressure inside the bottle pushes the paper ball out.

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Air pressure drops inside the bottle and the air is pressed inside and the paper ball is pushed out.

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Air pressure near the mouth of the bottle drops and greater air pressure inside the bottle pushes the paper ball out.

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Solution

The correct option is A Air pressure near the mouth of the bottle drops and greater air pressure inside the bottle pushes the paper ball out.
Bernoulli noticed that air has a lower pressure when it's moving more quickly. As you blow into the mouth of the bottle the air is moving fastest - so is at the lowest pressure. Inside the bottle, the air is moving more slowly - so higher pressure. As the pressure is higher inside the bottle than in the mouth this pushes the paper out.

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