Evan is researching warming trends across the Southwestern part of the United States over the past fifteen years. He is specifically interested in temperatures during the months of June–August. Which source would be most relevant for Evan's research?

A). A line graph from the National Oceanic and Atmospheric Administration showing average summer temperatures in the Southwest United States from 2001–2015.

Explanation:

As per the given details, the most significant source that would assist Evan in his research would be a 'line graph issued by the National Oceanic and Geographic Administration which display standard temperatures during the summer season in the SouthernWest part of the United States among the years 2001-15.' This would assist him in analyzing the warming trends in that part for the last fifteen years and make reliable conclusions. Thus, option A is the correct answer.

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