In order to check the solutions added while creating multi-part question, you can:
1. Click on "Courses" in the side navigation bar.
2. Select "Content Repository"
3. Once done, click on the "Questions" tab here.
4. Click on the drop-down indicated by three dots against the question for which the solution needs to be viewed.
5. Once done, click on the "Edit" option in the drop-down.
6. Here, you can click on the edit icon represented as a pencil against the question.
7. Once done, click on the "Settings" drop-down here for the question.
8. Once done, you can view the solution for the question by scrolling down at the end.