choose proper punctuation

Why are you guessing? Do you have reasons for your choices?

http://grammartips.homestead.com/directaddress.html

http://englishplus.com/grammar/00000070.htm

Yes, I am guessing a)according to the comma rule 1:

Use a comma to separate the elements in a series (three or more things).

English is my 2nd language so I read and guess my best according to the rules,still I'm never too sure.

am I right?

Yes, "a" is correct. Be sure to read both little articles I've linked above. They are short and give the reasons for all the commas in your choice.

PS -- Since you are choosing your answers based on the rules (in this case, comma rules), then you're really not guessing! You believe you are correct, and you are posting to double-check. But you're not guessing!

The proper punctuation for the sentence "George, leave the room, shut the door, and be quiet" is option d) "b)George leave the room, shut the door, and be quiet."

Let's break down the punctuation in the correct answer:

- The name "George" is followed by a comma (,) to set it off as an introductory element or to indicate direct address.
- The phrase "leave the room, shut the door, and be quiet" is a list of actions. In a list of three or more items, a comma (,) is placed before the coordinating conjunction "and" (or "or") that connects the last two items.

Option b) lacks the necessary comma after "George," which is required to set off the name as an introductory element or to indicate direct address. Therefore, it is not the correct choice.

So, the correct answer is d) "b)George leave the room, shut the door, and be quiet," which includes the necessary comma and properly punctuates the sentence.