Considering the statement in the question, "What most people associate with Saturn," is a Noun Clause (N).
The whole question is:
Identify the clause as a noun clause (N) or an adjectival clause (A) "What most people associate with Saturn" are the rings around the planet.
Definition of a Noun Clause.
A Noun Clause is a type of clause that is dependent. It usually serves as Noun, which functions as the subject, object, subject complement, etc.
In this case, "What most people associate with Saturn" serves as a noun clause, to the phrase "are the rings around the planet, " to make a complete sentence.
Hence, in this case, it is concluded that the correct answer is "Noun Clause (N)."
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