View previously chosen answers when retrying quiz

There's no built-in functionality for that. 

It could be done by tracking answers with variables and using triggers to show the appropriate red X or green check with conditions based on the associated variables. However, that would only work with shuffling turned off. (If the responses are shuffled, you won't be able to place the X's and checks next to the corresponding responses.) 

If you decide to try it, here's the User Guide info on trigger conditions and variables:

• https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-triggers#conditions
• https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-variables

IMHO, the better option would be if you could convince the client that it's not worth the effort. After all, feedback could be given when the user answers each question and/or during a review. 

Thanks. I thought about using triggers and variables but that would mean creating 50+ variables. Guess you are right, its not worth the effort. Thanks a lot for your answer