To keep safe is very important. When you are alone at home, you should ______________ to protect yourself.

① have a list of phone numbers to call for help, such as 110, 119 and 120

② play computer games while boiling some water

③ keep the door locked

④ pay attention to the gas, water and electricity

⑤ let anybody in immediately when you hear the doorbell

A、①④⑤

B、②③⑤

C、①③④

D、②④⑤