CodeHS Animation and Games Practice Test

The `setAnimationSpeed()` function specifically adjusts the speed at which an animation plays. This means that when called, it modifies the rate at which the frames of the animation are displayed, allowing animations to be sped up or slowed down. By tweaking the animation speed, you can create a more dynamic viewing experience and tailor the timing to fit the overall mood or pacing of the game or animation project.

In contrast, setting the duration of an animation refers to determining how long that animation lasts, which is not the same as adjusting the speed. Stopping all animations and increasing the resolution of the animation relate to entirely different functionalities and purposes within the animation framework. Stopping animations would halt any ongoing visual movements, while increasing the resolution pertains to the quality and detail of the visuals rather than their playback speed. Thus, the correct choice focuses specifically on modifying how fast or slow the animations are presented.