A nurse is creating a plan of care for a toddler who is 12 months of age. Which of the following developmental milestones will help guide the nurse in developing a plan of care?

A. Playing with other children typically develops in later toddlerhood or preschool years (parallel play). B. At 12 months, toddlers exhibit separation anxiety and look for their parents when they leave. C. Noticing when others are upset typically develops closer to 18 months to 2 years. D. Mimicking other children usually begins around 18 to 24 months.