The primary purpose of sentences 4 and 5 of the second paragraph is to distinguish different types and degrees of uselessness, as stated in option D.
We can define the primary purpose is the most important goal an author has when writing. The primary purpose is the whole reason behind the writing itself, that is, the "why" that led the author to write at all.
In the second paragraph, sentences 4 and 5 have the purpose to distinguish different types and degrees of uselessness, which is shown by the use of words and phrases such as "among" and "actually are."
With the information above in mind, we can select option D as the correct answer.
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