The answer is b. adjective clauses have to meet three requirements: a subject, verb, and they have to start with words like (whom, which, whose, that,).
Your answer is B. "Which are light blue" is an adjective clause.
The adjective clause in the sentence is "which are light blue" as it describes the noun "socks". This clause starts with the relative pronoun 'which' and provides additional information about the socks. Therefore, the correct answer is B. which are light blue.
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