Answer:
The dialogue that is punctuated correctly is the last one:
Coretta said, "I want to read that book!"
Explanation:
When we use direct speech, we write a dialogue in the exact words said by a character. To separate our words - or the narrator's words - from the character's, we must use a comma followed by quotation marks. Also, exclamation or question marks and periods must come inside the quotation marks, since they refer to the intonation of the character's speech. Thus, If I wish to tell someone that Coretta said that she wanted to read that book, the proper way to do it would be:
Coretta said, "I want to read that book!"
