Which of the following sentence is it the mai which of the following sentence is a command?

The answer is B. it is a command since it is telling someone to do something

B is a command , when giving a command you are asking or telling to" in this case she/he is asking , "Please lock the door when you leave."
 
also because you are telling someone to do something. 

i hope this helps

At midnight thomas edison opened the door and continued his work, but to his surprise it was so late that he had to get some rest. but with his mind racing and his mind at sake he continued working. hours and hours went untill he got it. he had invented the worlds first lightbulb!

The lower class, the groundlings, paid the lowest amount. this is the answer for edgenuity