Which sentence contains an adjective clause? A. The animal that we adopted yesterday was a dog. B. The dog became comfortable fairly quickly. C. Did you adopt a dog or a cat? D. The dog might sleep beside my bed tonight.

Answer

A. The animal that we adopted yesterday was a dog.

Identify which sentence contains an adjective clause.
An adjective clause modifies a noun, so we need to find a sentence that has a clause that acts as an adjective.
Option A: The animal that we adopted yesterday was a dog. This sentence contains an adjective clause 'that we adopted yesterday' which modifies 'the animal'.
Option B: The dog became comfortable fairly quickly. This sentence doesn't have an adjective clause in it.
Option C: Did you adopt a dog or a cat? This sentence doesn't have an adjective clause in it.
Option D: The dog might sleep beside my bed tonight. This sentence doesn't have an adjective clause in it.