Here’s a simple graphic that shows how graded questions are displayed.
For more details, check out these two sets of graphics.
The first set of graphics shows how it works when the question is answered correctly. The second set of graphics shows how it works when the question is answered incorrectly.
If you still think that you’re answering it correctly, but it is marked incorrectly, I encourage you to recreate these screenshots for the question you’re working on. Despite trying multiple times, I have not been able to get the question to score the answer incorrectly.
First Set
The first graphic (below) shows the unanswered question with randomized answers.
The second graphic (below) shows the question answered correctly.
The third graphic (below) shows the graded question. Note that all the highlighting is green because all the answers are correct.
Second Set
The second set of graphics shows how it looks when the same question is answered incorrectly.
The first graphic (below) shows the unanswered question with randomized answers. (Click to enlarge.)
The second graphic (below) shows the question answered incorrectly. (Click to enlarge.)
The third graphic (below) shows the graded question. (Click to enlarge.) Note that the correct answers are highlighted in green and the incorrect answers are highlighted in red.