Final answer:
The sentence 'He has large busy ears, a black nose, and no tail.' is a simple sentence since it consists of a single main clause that expresses one complete thought without any dependent clauses. The correct option is A.
Step-by-step explanation:
The type of sentence described in the question "He has large busy ears, a black nose, and no tail." is a simple sentence. This is because the sentence contains only one main clause which expresses a single idea. A main clause consists of a subject and a predicate and has the ability to stand alone as a complete sentence.
In contrast, a compound sentence would involve two or more independent clauses usually connected by a conjunction, while a complex sentence would include one independent clause and at least one dependent clause. A compound-complex sentence would involve two or more independent clauses and at least one dependent clause. In this case, the sentence presented doesn't fit these definitions as there is only one subject "He" and one predicate that follows, making it a simple sentence structure.