Starting a Sentence with "It Is" or "There Are" Is

Multiple Choice

Starting a sentence with "It is" or "There are" is

A) usually a sign that the sentence could be shorter and more active.
B) perfectly acceptable, and you need not try to rewrite the sentence.
C) a sign that you are using active voice.
D) a sign that you are using passive voice.
E) a good way to emphasize your point.