record the numbers of leaves in a data table photograph each leaf type using a camera record the sizes of different leaves in a notebook calculate the percentages of all leaf types using a calculator
I gave my students this multiple choice question: A researcher notices differences in the shapes of leaves on different trees of the same species. Which of these is the most accurate way to record these differences?

Only one answer is correct among these 4 choices:
- record the numbers of leaves in a data table
- photograph each leaf type using a camera
- record the sizes of different leaves in a notebook
- calculate the percentages of all leaf types using a calculator

Could you tell me which one is correct?

photograph each leaf type using a camera