By seeing the format in which the text is written!
I would say that how you can tell if your speech is written clear and concise is by making sure your words aren’t misspelled, you use your grammar properly, you don’t go off topic, getting to the point of what you are taking about in a short manner and then going on to explain, make sure your audience can understand the point you are making easily, and chose wise words, get rid “that” and “there is.” Hope this helps..
Its D: A subject for a student.
its the same relationship like a writer uses words to write and the student is a person who studies and to study you need a subject.
The other choices don't have the same relationship between them.
