What are the examples of a good worker?
选项：

A:Be willing and realistic about what you can do.
B:If a fellow employee asks you to do something you're not sure about, you can directly say "yes" or "no".
C:Spend time getting into other people's work unless they specifically ask for your advice or help.
D:If you see debris littering the floor of your workplace, walk around it, then inform your boss that someone needs to do a little picking up.