Hello. You are not the text to which this question refers, which prevents me from providing an accurate answer. However, I will try to help you
The organization of short and long sentences allows the author to promote an organization of words that set the tone of the story. With this well-defined tone, through the structuring of the text, it allows the reader to understand the meaning of the story and how this story promotes an influence on the reader himself.
I think it’s A. Just a guess
The correct answer is D. simple.
A simple sentence contains only one independent clause. If a sentence has more than one independent clauses, then it's called a compound sentence. If it has one independent clause, as well as one (or more) dependent clauses, then it is a complex sentence. A run-on sentence is a grammatically incorrect sentence which combines two or more independent clauses with a comma only, rather than with a conjunction.
