Answer:
d. involves the child's development of abstract thought.
Explanation:
Secretomotor stage is the 1st stage of the Piaget's theory of cognitive development.
1) Its duration is from zero to two years (0-2)
2) Child's intellectual ability is nonverbal.
3) He is mainly concerned with learking to coordinate purposeful movements.
4) After the age of 18 months , the concept of object permanence develops and the child starts to find the disappearing objects.
Hence option d. involves the child's development of abstract thought. is the right answer