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use "although" to join an adverb clause and an independent clause

Answer and Explanation:

An adverb clause is basically a dependent clause but with a subject and predicate/verb; despite having these two components, an adverb clause cannot stand alone because of a certain word or phrase.

Meanwhile, an independent clause has these two components and can stand alone.

In this case, the adverb clause's word or phrase is "although". Put into an example sentence, we can write:

Although the day was chilly, Bob decided to take a walk around the neighborhood.

In the above sentence, the adverb clause is "Although the day was chilly", and the independent clause is "Bob decided to take a walk around the neighborhood".

Hope this helps!

i'm pretty sure i had this question the other day and b was the right answer.