Depending on the way you have your assessments set in OHM, your students can see a summary of their assignments or tests that includes the version of the question they got, the answer they entered, and the score they received.
In order for your students too see assignment history, the assignment must have a due date set, and the due date must be passed.
Have your students enter the grade book from the left-hand navigation on the home page of the course. They will see this:
Click on the grade for the assessment you want to view, your student will see an itemized summary of the assignment, including the version of the question they received, as well as the answers they entered (2), and the score they received (1).