C because irrelevant means that something is not important to a conversation. For example we’re talking about video games and suddenly bring up something about pizza. Hope this helps and please consider me as brainliest. :)
B. monopoly
Since that company bas almost all of the long phone service, it means that the company is a monopoly because it has exclusive control over phone service in general. There's little competition, so the company can do almost anything it wants to (even raise prices they charge their customers).
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He is sad and worried because the loved his grandkid a lot and that’s his day one so he love him a lot