A 3-year-old child with Down syndrome is a

问题：

A 3-year-old child with Down syndrome is admitted to the pediatric unit with asthma. The child doesn't enunciate words well and holds onto furniture when he walks. The nurse should ask the mother

A．how long the child has been like this.

B．if the child can walk without holding onto furniture.

C．how the child's condition today differs from his normal condition.

D．if the child always drools.