The fact that the author presents in "Smarter Without Smartphones" to support the claim that people are too preoccupied with checking their phones is this:
A. The author checked his or her email several times while writing the article.
What relevant fact did the author present?
The relevant fact that the author presented to support the fact that people have become increasingly preoccupied with their phones is his own culpability in checking his email several times while writing the article.
The author was speaking from his own personal experience because this was something that he witnessed himself. Thus, he knew the dangers that could result from this and warned students about it.
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