Five different students in Mr. Garcia's class have done an experiment once, and each one got similar results. What should the students do to increase the validity of their results?
A. Each student should do a few more experimental trials.
B. The students should ask Mr. Garcia for a different experiment to do.
C. The students should compare their procedures and try to revise them.
D. Each student should modify the experiment and see what results they get.
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