Harold is worried that his young son has not yet developed an understanding of object permanence. What is one piece of information that he would most likely benefit from knowing?
a. Piaget's observations are absolute and based on the best science available.
b. Concepts identified by Piaget shouldn't be taken seriously whatsoever.
c. Piaget was careful in selecting children from a range of cultures to give his observations broad validity.
d. Piaget may have been mistaken about the relative age ranges that some children acquire certain skills

Option-A

Explanation:

Piaget proposed a theory related to the development of mind of a child in terms of cognitive abilities and suggested that the cognitive abilities of a child develop in stages and referred the theory as a cognitive theory of development.

Object permanence is one of the stages of the development of the cognitive abilities in which a child learns about the external world through his experience, knowledge and abilities.

In the given question, if the person is worried about the object permanence than he should be befitted from the studies conducted by the Piaget as his studies were mostly based on the scientific evidence.

Thus, Option-A is the correct answer.

d is the correct answer

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.