What criterion for evaluating a graph used as evidence?

• A. The source of the data and whether the graph accurately represents the data
• B. The color of the graph
• C. The length of the caption
• D. The author's name on the graph

Answer: (A)

When evaluating a graph as evidence, the most important factor is where the data come from and whether the graph faithfully represents those data. A trustworthy data source—such as a reputable study or official statistics—helps you judge reliability, while an accurate representation means the visual does not distort the true values, trends, or comparisons shown. Check that axes are clearly labeled with units, the scale is appropriate (no exaggerated truncations or misleading boosts), and there’s no cherry-picking or omission of relevant data. If the source is questionable or the graph is sloppily or deceitfully drawn, its evidentiary value drops. Color, caption length, and the author’s name affect readability or perceived credibility but do not by themselves determine whether the data are presented accurately.