What Does It Mean If Portions of the Noncoding Regions

What does it mean if portions of the noncoding regions of the genome are conserved?

A) Exons code for proteins.
B) Exons are not as important as once was thought.
C) Introns and other supposedly useless,noncoding parts of the genome actually have important,unidentified functions.
D) Introns have no importance.
E) Introns must be excised to maintain consistency.