Seems pretty good, I don't see a problem with your answers.
Answer:
Graceful is to ballet dancer
Explanation:
The rest cannot be because they do not refer to humans!
Here are the answers to the given statements above:
1. The given sentence is an example of a complex sentence. This sentence includes an independent clause and dependent clause.
2. The given sentence is an example of a simple sentence. It only contains one independent clause.
3. This is an example of a fragment sentence, which misses the predicate.
4. This is an example of a simple sentence having a compound predicate. Hope this answer helps.