Why Is It That Many Students Do No Acquire Sufficient

Why is it that many students do no acquire sufficient communication skills as they pass through school?

A) Business communication skills can be learnt only through experience and they cannot be taught.
B) Most schools don't offer any business communication courses.
C) Since many perceive it to be such a difficult course they are discouraged from taking it.
D) Business communication is complex even for dedicated students.
E) It is an innate skill that cannot be taught.