The following sentences form a paragraph. Select the correct words and punctuation for each blank. ____ Congress restocked the library's shelves with Thomas Jefferson's enormous personal collection of books.

A) After the war
B) After the war,

The sentence is an example of an introductory phrase followed by a main clause. The introductory phrase is "After the war," which sets the context or time frame for the main clause about Congress restocking the library's shelves. Therefore, the correct choice is B), which correctly separates the introductory phrase from the main clause with a comma.