building evidence through ongoing investigation. identifying a hypothesis that supports the data. making conclusions about evidence from results. proposing data that is easy to understand.
I gave my students this multiple choice question: Some instruments record oxygen levels in the ozone layer of Earth's atmosphere. Keeping a record of this data for many years is an example of

Only one answer is correct among these 4 choices:
- building evidence through ongoing investigation.
- identifying a hypothesis that supports the data.
- making conclusions about evidence from results.
- proposing data that is easy to understand.

Could you tell me which one is correct?

building evidence through ongoing investigation.