Question

Fill in the blank with a suitable noun clause:
I didn't realize _______.

• A. you standing there
• B. while I was driving
• C. that my phone was switched off
• D. none of the above

Answer 1

The correct option is C that my phone was switched off

A noun clause is a dependent clause that functions as a noun. It usually begins with what, whatever, whom, that and other such relative pronouns. A noun clause can act as a subject, object, predicate nominative or object of a preposition, in a sentence.
Option C is correct as it is a that-clause that functions as the object of the verb "realized". The noun clause has a subject "my phone" and a verb "was switched off".
Option A is incorrect because it is not a noun clause, it is a phrase.
Option B is incorrect because it is an adverb clause of time; it does not function as a noun.
Option D is incorrect because the answer lies in C.