"The girl who is wearing a red ribbon is my sister." The underlined words are a:

Question

Accepted Answer

The underlined words "who is wearing a red ribbon" in the sentence "The girl \underline{	ext{who is wearing a red ribbon}} is my sister." form an adjective clause. Here is a detailed explanation supporting why Option 2 is correct and why the other options are incorrect:

1. **Explanation for Option 2 (Adjective Clause):**
   - An adjective clause is a dependent clause that functions as an adjective, meaning it modifies a noun or pronoun. In this sentence, the clause "who is wearing a red ribbon" provides additional information about the noun "girl." It describes or specifies which girl is being referred to, thus functioning as an adjective. The clause begins with the relative pronoun "who," which is commonly used to introduce adjective clauses. Therefore, the underlined words are correctly identified as an adjective clause.

2. **Explanation for why Option 1 (Noun Clause) is incorrect:**
   - A noun clause functions as a noun within a sentence. It can act as a subject, object, or complement. In this case, the underlined words do not serve as a noun or take on any noun roles. Instead, they describe the noun "girl," which is characteristic of an adjective clause, not a noun clause.

3. **Explanation for why Option 3 (Adverb Clause) is incorrect:**
   - An adverb clause modifies a verb, adjective, or another adverb, providing information about time, place, condition, contrast, etc. The underlined words do not modify the verb or provide such information. Instead, they specifically describe the noun "girl," which is not the function of an adverb clause.

4. **Explanation for why Option 4 (None of the above) is incorrect:**
   - The underlined words clearly fit the definition of an adjective clause, as they provide descriptive information about the noun "girl." Since they do not fit the criteria for a noun clause or an adverb clause, and they do indeed form a recognized grammatical structure, Option 4 is incorrect.

In conclusion, the underlined words "who is wearing a red ribbon" are an adjective clause because they modify the noun "girl" by providing additional descriptive information. This supports Option 2 as the correct answer.