The correct answer is D. How are the sentences written—simple or complex, short and choppy, or long and hard to read?
Explanation:
In texts, the structure refers to the elements that are part of a text and the way these are organized. This includes the general structure or sections in a text, for example, introduction, body, and conclusion, and also the structure within a paragraph such as the type of structure that paragraph has and the types of sentences used. In terms of sentences, this is an important aspect of structure because depending on whether they are simple, complex, compound, etc. the general structure and complexity of the text vary. According to this, one of the questions you should ask yourself when analyzing structure is "How are the sentences written—simple or complex, short and choppy, or long and hard to read?".