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A) Create multiple ad groups that target different devices, and monitor the results
B) Set up an experiment to test which device he should target
C) Create multiple campaigns that target different devices, and monitor the results
D) Segment his campaign statistics table by device
Explanation:
Use segments to bring out what’s most important to you in your AdWords tables. With segments, you can split your data into rows, isolating exactly what you want to see. Your segment choices vary depending on which table of your AdWords account you're viewing, but may include periods of time, click type, or device.
A category (like ad type or day of the week) that you can add to your campaign’s tables and charts in order to organize your performance data around that criteria.
Read more here: https://support.google.com/adwords/answer/2370266?hl=en