Your question is Choose Randomization Unit for Ride Test. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You work on a ride-sharing marketplace and want to test a change that could affect how riders and drivers are matched. There is concern that the treatment may spill across trips or users, so the choice of randomization unit matters.
How would you think about the right unit of randomization for this experiment, and why? Explain how your choice would affect the validity of the test and the conclusions you would draw.