20. which event below is independent of event a? a: you get to work on time. you remember to pick up milk on the way home. your alarm goes off. there are no accidents on the road. it's snowing outside.

What you do on the way home has nothing to do with what you have to do to get to work in the morning. So the answer you want is A.

There were no accidents to delay you. That's relevant. It helps getting you to work on time.

It's snowing. That's a real hazard to be overcome. You could be late because of the snow. It's very relevant.

Your alarm better go off, especially if you were up late watching TV. Only A does not matter.

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