We decided to go out for a walk. Although it was raining. The second sentence is a sentence fragment, and it can not stand alone. We can correct it by attaching the fragment to its previous sentence: We decided to go out for a walk although it was raining

We decided to go out for a walk. Although it was raining. The second sentence is a sentence fragment, and it can not stand alone. We can correct it by attaching the fragment to its previous sentence: We decided to go out for a walk although it was raining.
A.正确
B.错误
正确答案：正确