Credible distractors
Wrong options drawn from the same material: near-misses, not throwaways.
A multiple choice question depends on its distractors. Absurd options measure test-taking skill. Options based on common mistakes make the question a better test of understanding.
Common faults include options with visibly different lengths, "all of the above", unconditional claims, and grammatical mismatches between the stem and an option. The generator checks for these faults. The "avoid obvious wrong answers" setting also checks each distractor for plausibility.
Option count is a trade-off, not a tradition. Four options is the default for a reason: three raises the guessing floor to 33%, five usually forces one filler distractor. If your material only supports two strong wrong answers, three good options beat four with a passenger.
Review remains yours. A generated question is a strong draft: check that the correct answer is defensibly correct in your context, and that no distractor is accidentally true in your organization’s edge cases.