I believe the answer is C. Both Versions explain the background of scientific phenomenon.
What poem are u talking about??
The change that was made in the second sentence is that it created a compound sentence. The correct answer is option B. The compound subject now has two independent clauses: "The holidays are just around the corner" and "I need to go shopping". The independent clauses are connected with the coordinating conjunction "so".
Maybe if you put which book are you talking about or text I will be able to help you