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.