Which sentence correctly uses a comma to separate the introductory phrase? the children's literature center, displays the world's smallest book. the world's smallest book, is on display in the children's literature center. in the children's literature center, the world's smallest book is on display. on display in the children's literature center is the world's, smallest book.

"in the children's literature center, the world's smallest book is on display." is the correct answer because all of the other answers can be eliminated for their improper use of the comma. the comma in its correct form causes a pause in speech or reading. The other incorrect uses of the Comma in this question are awkward and do not make sense. I used the process of elimination in determining the correct answer.

The correct answer is c