A nurse is teaching the guardians of a child who has a new onset of seizures and is to undergo an electroencephalogram about the procedure. Which of the following instructions should the nurse include in teaching?

Rationale: A. An electroencephalogram (EEG) requires the child to remain still for accurate brain wave recording. While comfort measures may be used before the procedure, active distraction during electrode placement and recording is not the primary teaching point and may not be sufficient to ensure cooperation or stillness. B. An EEG does not require fasting. There are no dietary restrictions unless specifically ordered for additional testing or sedation, which is not routine for a standard EEG. Therefore, this instruction is unnecessary and misleading. C. Sedatives are generally avoided because they can alter brain wave activity and interfere with accurate EEG results. In most cases, the child remains awake or may be asked to sleep during parts of the test to capture normal and sleep-related brain activity. D. Clean hair without oils, sprays, gels, or conditioners ensures proper electrode adhesion to the scalp and improves signal quality. Hair products can interfere with electrical conductivity and distort EEG readings, so proper hair preparation is an important pre-procedure instruction.