Allison Has Written and Rewritten the Central Idea of Her

Multiple Choice

Allison has written and rewritten the central idea of her speech on the topic of 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.
D) Her central idea is not a declarative sentence.