Preventive examination of a 9- year-old girl has revealed one matte white spot (chalk-like and lacking its natural luster) on the enamel of her tooth 21 in its pericervical region on the vestibular surface. The girl has no subjective complaints. What is the most likely diagnosis in this case?

• A. Initial caries
• B. Enamel hypoplasia
• C. Superficial caries
• D. Dental erosion
• E. Fluorosis