compare many variables. display data as parts of a whole. track the relationship between two variables over time. organize data using pictures of objects.
I gave my students this multiple choice question: A line graph is best used to

Only one answer is correct among these 4 choices:
- compare many variables.
- display data as parts of a whole.
- track the relationship between two variables over time.
- organize data using pictures of objects.

Could you tell me which one is correct?

track the relationship between two variables over time.