The students in the front row not the back were talking during the test.
Select the answer that shows the correct punctuation of the parenthetical expression.
The students, in the front row not the back were talking during the test.
The students in the front row not the back were talking, during the test.
The students in the front row, not the back, were talking during the test.
The students, in the front row, not the back were talking during the test.