下列烷烃在光照下与氯气反应，只生成四种一氯代烃的是                    [ ]

A．CH₃CH₂CH₂CH₃              

B．CH₃CH(CH₃)₂ 

C．CH₃C(CH₃)₃                  

D．(CH₃)₂CHCH₂CH₃

Which intervention will best help to prevent a client from falling ？（）

A．Monitor the client regularly or continually if his condition warrants it.

B．Keep the bed at a level where the nurse can easily provide care.

C．Make sure the side rails of the client's bed are down.

D．Restrain the client to prevent him from getting out of bed and falling.