Final answer:
Kristof uses logical and quantitative evidence, such as facts and statistics from credible sources, to construct a persuasive argument.
Step-by-step explanation:
Kristof primarily uses logical evidence to make a convincing argument. This type of evidence includes quantitative data, such as facts, statistics, and examples, which appeal to the reader's sense of logic. Additionally, Kristof uses credible sources to support his evidence, thereby strengthening the impact of his argument. These sources are evaluated for their reliability and relevance to ensure that the evidence presented can effectively back up the points made. In academic arguments, it is essential to use evidence that is considered valid in the field of study, which could range from statistical data to logical development of points, as well as direct quotations from primary sources.