Question

Select the correctly punctuated sentence.

John are you certain you understand? Emily asked.
"John, are you certain you understand?" Emily asked.
"John, are you certain you understand," Emily asked?
"John are you certain you understand?" Emily asked.
"John are you certain, you understand," Emily asked?

Answer 1

"John, are you certain you understand?" Emily asked. 

Answer 2

I think that your best answer to this question would be the second sentence i hope that this helps :)