To find the answer to any question, click the blue Show Explanation button under the question. This will show the answer to the question and the rationale behind each answer. It will also offer an explanation of why the other choice are incorrect.
You can also review the answers for your completed exams. To do this, click on the exam tab on the left hand side of your screen. Under your completed exam, you will see a green Review Responses button. Click that button, and follow the above steps.