The correct option is D All of these
When we suck through a straw, soft drink comes up as the atmospheric pressure presses it down to fill in the vacuum created. When the carbon-di-oxide is breathed out, a low pressure zone is created in the lungs. Due to atmospheric pressure, air pushes in naturally. When a liquid dropper is pressed, air inside it goes out. So, the liquid is acted upon by the atmospheric pressure to enter the dropper. So, all these actions are consequences of atmospheric pressure.