Why do two balloons come closer when we blow in the space between them ?

Greater pressure inside the balloons than the reduced pressure in between them drives the balloons towards one another.

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Blowing air in between increases the pressure in between the balloons pulls them closer.

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The gravitational force pulls the two balloons closer.

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None of the above.

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Solution

The correct option is C Greater pressure inside the balloons than the reduced pressure in between them drives the balloons towards one another.
When we blow between two balloons, they come closer because the pressure between the balloon decreases. The pressure inside the balloon would then push them towards each other.

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