I'm designing a multiple-choice quiz interface where several options might be the right ones and the user has to check all of them in order to win.
Once the user submits the answer, I want to display the results, including whether each option was correctly checked or left unchecked.
Currently, I'm showing a marker next to each option to indicate the status, but it seems to be confusing. I prepared an alternative design where a single marker is shown and the wrong answers are underlined:
This alternative version seems to be better, but I'm concerned whether the under-linings are meaningful, especially for color-blind people.
What may be a better approach for this?