average the amount of rain that fell during a lightning storm count number of lightning strikes during a one-hour period record rainfall amounts in storms with and without lightning calculate the number of fires that are caused by lightning strikes
I gave my students this multiple choice question: A student wants to find out whether storms with lightning produce more rain than storms without lightning. Which is the best way to answer this question?

Only one answer is correct among these 4 choices:
- average the amount of rain that fell during a lightning storm
- count number of lightning strikes during a one-hour period
- record rainfall amounts in storms with and without lightning
- calculate the number of fires that are caused by lightning strikes

Could you tell me which one is correct?

record rainfall amounts in storms with and without lightning