Final answer:
A possible speech impairment can be investigated in a pediatric client who only answers questions with single words.
Step-by-step explanation:
A possible speech impairment can be investigated in a pediatric client who only answers questions with single words. This is because speech impairment may manifest as difficulty expressing oneself using full sentences and limited vocabulary. A 5-year-old who only answers questions with single words may indicate potential speech impairment that requires further assessment and intervention.