Answer: D. Facts
Step-by-step explanation:
A scientific cycle is a detail procedure which involves the pattern of some phenomena, making a hypothesis, making predictions based upon the hypothesis, testing the prediction on the basis of the experimental procedure, making conclusions and framing the result.
According to the given situation, D. Facts is the correct option. As the graph is directly describing the statistical output of the comparative analysis of the increase in global temperature per year due to increase in abundance of the carbon dioxide in the atmosphere.