In the context of Piaget's stages of cognitive development, which of the following statements is true of the sensorimotor stage?
A. Object permanence is the biggest event of the sensorimotor stage.
B. Infants lack any physical actions during the sensorimotor stage.
C. the sensorimotor stage is the last stage in the cognitive development of infants.
D. the sensorimotor stage lasts from 2 to 7 years of age.