Final answer:
The best description of the sexual history for a pediatric health history is allowing the patient to introduce sexual activity history.
Step-by-step explanation:
The best description of the sexual history for a pediatric health history is b. allows the patient to introduce sexual activity history. When discussing the sexual history of a pediatric patient, it is important to respect their privacy and provide a safe space for them to disclose any relevant information. By allowing the patient to introduce their sexual activity history, the nurse ensures that the discussion is initiated by the patient and respects their autonomy.