A noun clause is a subordinate clause that is used as a noun. A noun clause may be used as a subject, a direct object, an object of a preposition, or a predicate nominative. A noun clause usually begins with one of these words: how, that, what, whatever, when, where, which, whichever, who, whom, whoever, whose, why.
Which sentence contains a noun clause?

However, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. what would be the best way to revise this sentence for greater clarity? a) however, the fact that columbus left spain thousands of years after people settled what would become the united states never dawned on me. b) it never dawned on me, however, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain. c) however, the fact that people were already living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. d) however, the idea never dawned on me that long before columbus ever left spain, real-life people lived for thousands of years in what would become the united states.

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The point of view that london uses in white fang the reader understand the perspectives