Rule #10: Use ‘All of the Above’ and ‘None of the Above’ with caution
I hate this rule because when you run out of distractors, All of the Above and None of the Above can come in handy. But they may not promote good instruction. Here’s why. All of the Above can be an obvious give-away answer when it’s not used consistently. Also, the All of the Above option can encourage guessing if the learner thinks one or two answers are correct. In addition, the downside to None of the Above is that you can’t tell if the learner really knew the correct answer