Some of my students are complaining that Canvas Quizzes are more difficult than paper quizzes, and one major reason is that they can not cross out wrong answers as they are thinking through a multiple choice problem. I recommend adding a way for users to do this. It could be as simple as giving an option to use tri-state buttons while they are thinking through things.

Ideally this would look like a small x button somewhere around the response option, but away from the checkbox normally used to select a response. This should cause the entire answer option to change to strikethrough text. This could be an option for individual quizzes, or enabled at the user level.

Even with just 3-4 options, there is a significant mental load to remembering thoughts about all of the possible responses, and this would help significantly. This is especially true now while we are teaching remotely and do not have a good way to offer students an alternate exam format.