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When we press the bulb of a dropper with...

When we press the bulb of a dropper with its nozzle kept in water , air in the dropper seems to escape in the form of bubbles. Once we release the pressure on the bulb , water gets filled in the dropper. The rise of water in the dropper is due to

A

a) pressure of water

B

b) gravity of the earth

C

c) shape of rubber bulb

D

d) atmospheric pressure.

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