What effect can be used to slow down a clip in After Effects?

The ability to slow down a clip in After Effects is primarily achieved through Time Remapping. This effect alters the timing of a layer, allowing for precision control over how fast or slow the footage plays. By enabling Time Remapping on a layer, you can create keyframes that define specific points in time, effectively speeding up or slowing down playback between these points. This not only allows for variable speeds throughout the clip but also provides the flexibility to create complex timing effects, such as slow motion or even reversing the clip.

Other options, while related to video speed manipulation, do not offer the same versatility. Speed Control and Frame Rate Adjustment are more general terms that do not refer to specific tools or effects in After Effects that allow frame-by-frame adjustments. Time Stretch, while it does allow for slowing down or speeding up a clip by modifying the duration of the layer, does not provide the same granularity offered by Time Remapping when it comes to keyframe-based adjustments. Therefore, Time Remapping stands out as the correct choice for achieving a slow-motion effect with control over the timing.