A Squirt Gun Is a Simple Type of Water Pump

A squirt gun is a simple type of water pump in which a plunger attached to the trigger forces water out of a nozzle and across the room. When you squeeze the trigger of the gun, water squirts out of the nozzle because

A) the pressure inside the gun is higher than atmospheric pressure.
B) the water is compressed at the plunger so it must expand out the nozzle.
C) the Bernoulli effect causes the pressure of water leaving the nozzle to be less than atmospheric pressure.
D) the Bernoulli effect causes the water's overall energy to increase as it travels through the narrow nozzle.