(D) Which complex sentence has correct punctuation?

Complex sentences can sometimes be tricky, but the basics of punctuation can make them shine! For example, in the sentence, "Although it was raining, we decided to go for a walk," the comma after "raining" is essential. It separates the dependent clause from the independent one, making it clearer and easier to read. An important tip to remember is that if the dependent clause comes second, like in the sentence "We decided to go for a walk although it was raining," you can skip the comma. It’s all about leading your reader with clear signals! So embrace those punctuation rules and make your complex sentences sparkle!