> A tangent: writing distractors for multiple choice questions is hard.
In case of online quiz you can have a "competition" between distractors:
1. start by having much more distractors than needed and pick randomly
2. for each measure the probability of it getting clicked (clicks/times it's shown)
3. show the most frequently clicked distractors more often
Yeah, as I researched the topic of multiple choice exam design, seems the rule of thumb is to reject outright any distractors that are chosen by less than 5% of test takers.