Isabel is researching the effects of deforestation using online sources. She finds an environmental study on the relationship between deforestation and local weather. Which of the following characteristics should this study have in order for its results to be considered valid?

I. Empirical observations
II. Evidence that can be replicated
III. Outcomes that don't change with new experimentation

A. I and II
B. II and III
C. I and III
D. I only