The great scientist, Timothy O., is sitting in his highchair observing what happens to mashed peas, applesauce, and Cheerios as they hit the floor and walls. The groans emitted by his caregiver simply...

The great scientist, Timothy O., is sitting in his highchair observing what happens to mashed peas, applesauce, and Cheerios as they hit the floor and walls. The groans emitted by his caregiver simply provide an interesting background but are of no real consequence. Timothy O. is likely to be in which substage of sensorimotor development?