A question to reach the final rejected state will depend on the number of reviewers assigned for the exam/question.
As a reviewer, if you feel the question does not meet the requirements, then you should reject the question. On clicking the Reject button, a dialog box will ask you to enter a mandatory explanation for the rejection.
If there are more than one reviewer, the rejection process will need to meet the rejection criteria decided for the exam/question.
For eg. If there are two reviewers for an exam/question a minimum of 2 reviewers or as decided will be required to reject an exam/question.
The user rejecting the question will get the pop up window to choose the state, if the question state is going to be changed.