How do seashells get their patterns?

The formation of shells can also create patterns. As the animal grows inside the shell, it’s home must get bigger, and so they grow their shells layer upon layer, creating ‘growth-bands’, or growth increments, within the shell. Over time, these close-to-identical bands form patterns.
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Ithink the answer is d) once again don't kill me if i got the answer wrong > _<

You are left with 8 pounds and 12 ounces or140 ounces (since there are 16 ounces per lb).divide 140 ounces by 2 ounces (serving size): you'll get 70 servings!