Identify the sentence which contains a coordinating connection.
After we realized my sister had outgrown her running shoes, we drove to the shoe store.
Although she had purchased new running shoes two months before, her feet measured a full size bigger now.
As a result, she decided to buy shoes which were a size and a half bigger than her old pair.
She tried on several pairs, and she chose a blue and grey pair to replace her old shoes.
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I believe it is B. Although she had purchased new running shoes two months before, her feet measured a full size bigger now.