Question

Which is the adjective clause in the following sentence?

Answer 1

The correct answer is: Option A. When phones had cords.

An adjective clause meets three requirements in order to serve as an adjective:

• Contains a subject and a verb.
• Starts with a relative pronoun (who, whose, which...), or a relative adverb (when, why, where...).
• Answers questions such as How many? or When did it happen?

Regarding the sentence in the example:

• Phones is the subject and had is the verb.
• Starts with the relative adverb When.
• Answers the question When did it happen?

Option A meets all requirements for an adjective clause.

Answer 2

A. When phones had cords. Adjective clauses usually start with words like when, where, whom, who, that, which, etc. They are usually sentences that have something about to describe a noun (when-adjective, phone-noun).