Can the Pronoun Be Omitted from the Beginning of a Noun

Multiple Choice

Can the pronoun be omitted from the beginning of a noun clause?

A) No, because that would never sound right to anyone.
B) No, because then the meaning of the sentence would never be clear.
C) Sometimes.
D) Yes, because such pronouns never provide any part of the clause's meaning.
E) Yes, because such pronouns are never necessary.