From LimeSurvey Manual
Random answer order (random_order)
This attribute causes LimeSurvey to ignore the existing order of answer options/subquestions, and instead it orders them randomly. This option permits the survey creator to diminish the survey bias. Please note that if a question has subquestions, the order of subquestions will be randomized, not the order of the answer options.
- Yes - Randomize when participant enters survey
- No (default)
See this example (outside link) to better understand how to use different LimeSurvey randomization features.