I think its d. is your answer but don't hold me to it :)
The answer is c. Emphasis.
Answer:
Noun clause
Explanation:
A noun clause or nominal clause is a dependent or subordinate clause that does the work of a noun in a sentence. It generally functions as an appositive, the subject or the object of a transitive verb, complement of a subject, object, and preposition.
I hope this helps you in any shape or form.
