Lilli Accidentally Discovers That If She Bounces While Sitting in Her

Multiple Choice

Lilli accidentally discovers that if she bounces while sitting in her infant seat, a toy attached to the seat spins around. Entranced by the movement of the toy, Lilli continues to bounce and bounce and bounce. Lilli's behaviour is most characteristic of infants in which substage of the sensorimotor period?

A) substage 2 (1 to 4 months)
B) substage 3 (4 to 8 months)
C) substage 4 (8 to 12 months)
D) substage 5 (12 to 18 months)