Why Does the Federal Government Have Broad Powers to Regulate

Why does the federal government have broad powers to regulate the use of the airwaves?

A) They are considered public property.
B) They are not newspapers, so freedom of the "press" doesn't apply.
C) Compared to newspapers and magazines, they are a "new" media and so require regulation until it is established.
D) Because airwaves can go over international boundaries, they are subject to international regulations, which must be upheld.
E) There is no government regulation of the airwaves at all.