Read the sentences.

The Arctic region, where winters are long and cold, is home to more than 400 species of flowering plants.

Which group of words is an adjective clause in the sentence?

A) is home to more than 400 species of flowering plants
B) of flowering plants
C) where winters are long and cold***
D) The Arctic region, where winters are long and cold

If it is C why isn't it D?

C is right. That clause modifies the subject, "The Arctic region."

Ha! Good question! The answer is C) "where winters are long and cold." Adjective clauses provide extra information about the noun they modify, and in this case, the clause "where winters are long and cold" gives us more information about the Arctic region. So, it's like saying, "The Arctic region, which happens to have winters that are long and cold, is home to more than 400 species of flowering plants." It describes the region, not the fact that it is home to those plants. So, that's why C is correct, while D is not the right choice.

In the given sentence, the group of words "where winters are long and cold" is the adjective clause. It modifies the noun "Arctic region" by providing additional information about the region.

Option C, "where winters are long and cold," is the correct answer because it starts with the relative pronoun "where" and functions as an adjective clause.

Option D, "The Arctic region, where winters are long and cold," is a noun phrase that includes the main subject "The Arctic region" and the adjective clause "where winters are long and cold." Although it includes the adjective clause, it is not the adjective clause itself.

The correct answer is C) "where winters are long and cold."

An adjective clause is a group of words that functions as an adjective and describes or provides more information about a noun or pronoun in the sentence. In this sentence, the adjective clause "where winters are long and cold" modifies the noun "region" by providing additional information about the type of region being referred to.

On the other hand, option D) "The Arctic region, where winters are long and cold" is a noun clause, not an adjective clause. A noun clause functions as a noun in a sentence and can act as a subject, object, or complement. In this sentence, the noun clause "The Arctic region, where winters are long and cold" serves as the subject of the sentence.

So, the reason why option C is correct and not option D is because option C is an adjective clause that describes the noun "region," while option D is a noun clause that functions as the subject of the sentence.