Warm-Up 4/5: Causation (A.4B)

The number of soccerballs a team owns affects the number of games the team wins during the soccer season.

The amount of time a cell phone is used affects the charge of its battery.

The length of a rectangle affects the width of the rectangle.

The number of ice-cream bars sold affects the number of milkshakes sold.

Which situation best shows causation?