Which of the causal relationships stated in the following sentences is the sufficient condition? ( )
选项：

A:Pouring water on a wood fire will cause it to be extinguished.
B:Releasing the shutter of a digital camera causes an image to appear on the sensor.
C:Flipping the wall switch to the “up” position causes the overhead lights to go on.
D:Picking up a bat causes a baseball player to hit a home run.