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The correct option is B.
You can test if there are two independent clauses by separating the clauses and seeing if they can stand alone.
They hadn't planned the trip. They returned to the store the next day and bought more peanut brittle.
Since the the two clauses can stand alone, there are two independent clauses.
Two independent clauses constitute a compound sentence.
Answer: A
Explanation: Example 1 is not predicting future snowfall and isn't showing how snowfall affects people's daily lives emotionally. So B and C are out and Example 2 does not explain anything about what needs to be done. So D is out as well.