Answer: a).The child is not paying attention to the nurse's questions.
Step-by-step explanation:
The children prone to the attention deficit hyperactivity disorder are unable to pay their attention and they cannot stop their minds from the distractions. This is the reason of the child responding to "I don't know" to every question that the nurse asks. This is because the child cannot concentrate on the questions that the nurse was asking. This is one of the response given by the child under the influence of the attention deficit hyperactivity disorder.