Which of the following sentences contains a dependent clause?

A. My mother, who never wastes anything, rinsed and saved the take - out boxes.***
B. We were running late, and we had to skip stopping by the post office.
C. I had never been to New York until this spring.
D. You should take an umbrella to the game.

Correct.

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To determine which of the sentences contains a dependent clause, we need to understand what a dependent clause is.

A dependent clause is a group of words that contains a subject and a verb but cannot stand alone as a complete sentence because it does not express a complete thought. It needs to be connected to an independent clause to form a complete sentence.

Let's analyze each of the sentences:

A. "My mother, who never wastes anything, rinsed and saved the take-out boxes." - This sentence contains a dependent clause, "who never wastes anything." It cannot stand alone as a complete sentence because it does not express a complete thought.

B. "We were running late, and we had to skip stopping by the post office." - This sentence does not contain a dependent clause. Both "We were running late" and "we had to skip stopping by the post office" are independent clauses that can stand alone as complete sentences.

C. "I had never been to New York until this spring." - This sentence does not contain a dependent clause. It is a simple sentence consisting of one independent clause.

D. "You should take an umbrella to the game." - This sentence does not contain a dependent clause. It is also a simple sentence consisting of one independent clause.

Therefore, the sentence that contains a dependent clause is A. "My mother, who never wastes anything, rinsed and saved the take-out boxes."