Correct Answer: C

Rationale: The correct answer is C: Cigarette smoking. Discussing sensitive topics like cigarette smoking in the presence of a parent may inhibit the teenager's willingness to be open and honest. It's important to provide an opportunity for the teenager to speak privately with the healthcare provider. Choices A, B, and D are more general topics that can be discussed openly in front of the parent without compromising the teenager's privacy or comfort.

Correct Answer: A

Rationale: The correct answer is A, the principle of conservation. Piaget's principle of conservation relates to a child's ability to understand that certain properties of objects remain unchanged despite modifications in their appearance. In this case, the child's understanding that an arm will look the same after the IV is removed demonstrates conservation of appearance. Choice B, transductive reasoning, involves making faulty generalizations based on specific instances and does not apply in this context. Choice C, the principle of identity, pertains to recognizing objects as the same even if they undergo transformations, which is not directly relevant to the scenario. Choice D, reflex abilities, refers to automatic responses to stimuli and is unrelated to the child's understanding of the arm's appearance post-IV removal.

Correct Answer: D

Rationale: Using a cotton swab, allowing the child to observe, and demonstrating on someone else are effective ways to encourage a preschooler to open their mouth for examination.

Correct Answer: A

Rationale: The correct answer is A. By 8 months, an infant should be able to transfer objects between hands, which is an important motor skill milestone. This action shows coordination and developing fine motor skills. Choices B, C, and D involve more advanced motor skills that are typically not expected at 8 months of age. Drinking from a cup, holding a pencil to scribble, and engaging in purposeful play with toys are skills that develop later in infancy.

Correct Answer: C

Rationale: A BMI-for-age at the 85th percentile indicates a child is at risk for being overweight, according to the National Center for Health Statistics criteria.