Allison has written and rewritten the central idea of her speech on "Dog Care." She finally comes up with "Dog care is very difficult." What is the problem with this central idea?
A) Her central idea is not audience-centered.
B) Her central idea is too confusing.
C) Her central idea is too vague and does not restrain the number of main points.
D) Her central idea is not a declarative sentence.
Answer: C