Multiple Choice not working?

Hi,

I have chosen a multiple choice question.

1. A (Correct, 1 point)
2. B (Not correct, 0 points)
3. C (Not correct, 0 points)
4. D (Correct, 1 point)
5. E (Correct, 1 point)

If users check all boxes they get incorrect message, but 3 points (max) anyways…

This is of course not like how multiple choice questions should work…(This way my students can just check all choices to get full score).

How can I fix this?

https://www.ads-software.com/plugins/wp-pro-quiz/