Based on the fact that Seth is a computer technician who gives a presentation to top executives on current issues in technology, the main problem which causes him to lose his audience is his frequent use of jargon.
This refers to the domain-specific word that a person uses in a given field or area of expertise that is unique to them and is used exclusively by them.
Hence, we can see that based on the given question, Seth is a computer technician and he gives a presentation and as he talks about issues such as adware, biometrics, and dongles, his audience are lost and this is because he does not make use of general words.
With this in mind, the correct answer is jargon.
Read more about jargons here:
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