Macie Has Staining and Pitting of Her Teeth

Macie has staining and pitting of her teeth.She drinks three glasses of milk per day and enjoys yogurt as a snack.She lives in an urban area of the United States and regularly brushes her teeth and rinses afterward with a cavity-fighting solution.The cause of the stains and pits in her teeth are most likely caused by

A) excessive copper.
B) inadequate calcium.
C) excessive calcium.
D) inadequate fluoride.
E) excessive fluoridE.