Which sentence correctly uses commas to separate narration from the quotation? "you must tour the great hall," suggested the librarian ",if you enjoy architecture as well as books." "you must tour the great hall", suggested the librarian, "if you enjoy architecture as well as books." "you must tour the great hall" suggested the librarian, "if you enjoy architecture as well as books." "you must tour the great hall," suggested the librarian, "if you enjoy architecture as well as books."

"You must tour the Great Hall" suggested the librarian, "if you enjoy architecture as well as books."


A comma may be used correctly to do any of the following:
(a) join sentence when used with a conjunction.
(b). set off an introductory word, clause, or phrase.
(c) set off interrupting words or expression

Examples:

When he came, his mother ran unto him.
Talking about bugs, I don't like any of them.
Hey, did you do the thing I told you to do?
if you don't know how to answer that, you can ask me for help.