A nurse in a clinic is assessing a 7-month-old infant. Which of the following indicates a need for further evaluation?

Rationale: A. Fear of strangers (stranger anxiety) is expected around 6 to 8 months and indicates normal social development. B. Preference toward certain foods is common as solid foods are introduced and does not require further evaluation. C. A unidextrous grasp (persistent use of only one hand) at 7 months may indicate a neuromotor problem and requires further evaluation. Infants at this age should use both hands interchangeably. D. Babbling one-syllable sounds is expected at 6 to 9 months and is a normal developmental milestone.