Which question can be answered by following the scientific method? What was the highest temperature that was recorded yesterday?
What is the most interesting aspect of the light-dependent reactions? How does a change in temperature affect the stomata of a plant? How many stomata are there on this leaf?
Scientific method includes certain set of orderly procedures that is used to carry out an experiment in the laboratory and obtain the result based on the observations.
The option C requires proper experiment in the laboratory by varying the temperatures and its affect on the stomata of the plant.
So, the scientific method can be applied on the option C
