Rewriting the fifth sentence by including a relative clause would match option (d): "One aspect of changing to year-round schools is the elimination of a long summer vacation, an idea favored by many."
What is a relative clause?
One type of dependent clause is the related clause. It has a subject and a verb, but it is not a complete sentence. Relative clauses provide details about the item or person "(year-round schools)" being discussed.
It's frequently referred to as an "adjective clause" since it operates similarly to an adjective in that it provides more information "(eliminating long vacations)" in detail about a noun.
Therefore the depending factor favored by many is supporting the notion of eliminating a long vacation. So, "option (d) is the correct answer."
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