Tim is someone's name, and thus, <u>is a proper noun.</u>
<u><em>Explanation:</em></u> A proper noun is a specific noun. For example, "lake" is a common noun and thus do not need capitalization but Lake Michigan is a specific noun (because it's a specific place) and does need capitalized. All proper nouns need capitalization, and a common proper noun is someone's name.
Doctor can be used generally, you could say, "I think I need to go see a doctor" so that's not it
Uncle could work if you were referring to someone specifically. "My uncle is coming over" is using it in a general sense, but, "My Uncle John is coming over" is more specific, so that would be a specific noun but in this case, it isn't.
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Robot by itself is a common noun so it isn't an option. For example, "did you see this cool robot she's working on?" It's used in a general sense.
This one would have to be A! All of the others are wrong!
