The relative clause in the given sentences are shown in option (d) or (iv): "that serve the needs of the population"
<h3>What is a relative clause?</h3>
"Who, whom, that, and which" are relative clauses. These can also be referred to as Relative Pronouns, and they are used to provide more information about a place, person, or thing.
Therefore, In this statement, you could alternatively use which instead of that.
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Taking the meaning of the words into consideration, the best way to complete the sentence is the following:
Her ivory brow furrows in delicate lines (option A).
<h3>What is the meaning of furrow?</h3>
The original meaning of the verb "to furrow" is to make a a line on the surface of something. That may seem strange, but this verb is often used with the word "brow".
It is common to say that someone has a furrowed brow. That means lines have appeared above that person's eyes, usually indicating they are concentrating or deep in thought.
With that in mind, we can choose letter A to complete the sentence: Her ivory brow furrows in delicate lines.
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