Writers reach for B and C, because putting the answer first feels like giving it away and last feels like burying it. A learner who notices scores well above chance knowing nothing. Paste your bank and see where the answers actually sit.
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With 6 questions an uneven spread is ordinary chance rather than a pattern. This starts saying something useful at about ten, and says it clearly at thirty.
The threshold here is deliberately loose. Flagging a ten-question quiz because four answers landed in B would be noise, and a checker that cries wolf gets ignored on the day it is right.
Counts where the correct answer sits across the whole bank and shows the distribution against what an even spread would look like.
Putting the answer first feels like giving it away. Putting it last feels like burying it. So writers reach for B and C without deciding to, and across forty questions that becomes a pattern worth several points to any learner who has taken a few quizzes.
On a ten-question quiz an uneven spread is ordinary chance. Flagging it would be noise, and a checker that cries wolf gets ignored on the day it is right. This starts saying something useful at about ten questions and says it clearly at thirty.
Turning on answer randomization in the authoring tool solves this permanently and takes a moment. It is worth doing even when the distribution looks fine, because the bank will grow and the next twenty questions will drift the same way the first twenty did.