<span>Im pretty sure the answer would be B. Hope that helps.
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My school is the
<span> oldest in our town, and it is three stories high" is the sentence with the faulty coordination. The age of the school has nothing to do with the height of the school. </span>
simple sentence- Carrie whistled for Sassy, her cocker spaniel. Sassy came bounding down the stairs.
compound sentence- Carrie whistled for Sassy, her cocker spaniel, and Sassy came bounding down the stairs.