For multiple choice questions(Multiple answers allowed), the sum of the score ratios of each correct answer must be 100%.

Set the score ratio to '-100%'.

EX. 4 answers(2 correct answers / 2 incorrect answers)

→ Correct answer 50% / Correct answer 50% / Incorrect answer -100% / Incorrect answer -100%

EX. 5 answers(3 correct answers / 2 incorrect answers)

→ Correct answer 33.333% / Correct answer 33.333% / Correct answer 33.333% / Incorrect answer -100% / Incorrect answer -100%

(Note)