Identify the determiner(s) in the following sentence.
the new software that i downloaded requires a registration key.
a.
i, a
b.
new, i
c.
the, a
d.
the, that, a

C.  The, a

Explanation:

A determiner is a word that introduces a noun. Articles a, the are the most common of the determiners.

That can function as a determiner, too, but in this sentence, it is a relative pronoun introducing a relative clause.  

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an old person

explanation: