The primary purpose of sentences 4 and 5 is to distinguish different types and degrees of uselessness, as expressed in option D and explained below.
<h3>What is primary purpose?</h3>
- The primary purpose is the most important goal of objective.
- An author's primary purpose is his main reason to write something.
- Primary purposes can refer to the whole text or even to a single phrase.
The author's primary purpose for sentences 4 and 5 is to distinguish the different degrees and types of uselessness, which is done through phrases such as "among" and "actually are".
With the information above in mind, we can choose option D as the correct answer.
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