What makes this passage an example of expository prose?

B: it is clearly organized so the reader can easily follow along

The expository prose is that in which the main purpose is to define or explain a concept, normally stating a thesis supported in topic sentences. A good example is that used to explain a scientific principle, or simply, the cause of a conflict or a war.

In this case, the paragraph does not convey any feeling from the author,so option A is not quite possible. It does not use any run-on sentences, which are those that are not linked properly or gramatically do not use the correct words to join the ideas  the sentence expresses. It does not use filler words either,as it does not represent a dialogue or a conversation, and finally, although it focuses on a matter which might be important to students, this characteristic does not make this passage an exampleof expository prose, so, the correct answer to this question is B,because it expreses a clearly organized idea, which is that  an application process can be difficult, sipprted by a sentence which aims to explain what the first step for a student should be.    

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elon musk, ceo of spacex, a startup space company is planning to head to mars by 2023. nasa is planning to go to mars at around 2025. both are just for a basic colony.