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."

The sentence which correctly uses commas to separate narration from quotation is D: "You must tour the Great Hall," suggested the librarian, "if you enjoy architecture as well as books."  

The punctuation marks, such as commas and periods should be inside the quotation marks and the exact spoken words should be separated from the narration by commas. So, in this case, suggested the librarian is part of the narration and should be separated by commas from the quotations. The first comma should be included in the quotation marks and the second one should precede the quotation marks of the second quotation.  

i believe it is d.) previous creature