A nurse is assessing a child who is 4 years of age. Which of the following developmental milestone findings should be a concern to the nurse?

A. Occasional difficulty with turn-taking is common in 4-year-olds but should be monitored for improvement with social interaction. B. Sharing an event is appropriate for a 4-year-old and indicates developing communication skills. C. By age 4, a child should be speaking in complete sentences of at least 4 to 5 words. Speaking only two words in a sentence suggests delayed language development. D. Engaging in imaginative play is expected and demonstrates cognitive and social development.