The bolded words are noun clause.
A noun clause is
a dependent clause that
acts as a noun. Noun clauses begin
with words such as how, that, what, whatever, when, where, whether, which,
whichever, who, whoever, whom, whomever, and why. Noun clauses can act as subjects, direct objects,
indirect objects, predicate nominatives, or objects of a preposition.
The correct answer between all
the choices given is the third choice or letter C. I am hoping that this answer
has satisfied your query and it will be able to help you in your endeavor, and
if you would like, feel free to ask another question.
