Answer:
The correct answer is option - Both ideas could be scientific.
Explanation:
The ideas can be scientific if they are testable and more reliable if the results are the same repeatedly performing experiments. The idea or hypothesis is tested by the experiments.
Sam's idea is not rejected because the result could be different in experiments with different scientists due to the error in the experiment or a different methods. Repeated test results make joe's idea more reliable after tested repeatedly.
Thus, the correct answer is option- Both ideas could be scientific.