Based on the Article, which best replaces the question mark in the diagram above?
A. Toothbrushes are considered by many Americans to be more important than the cell phone.
B. Writings dating back to 1223 show that the Chinese cleaned their teeth with a brush made of horse tail hairs.
C. Dental hygiene and the importance of oral health took hold in the early part of the 20th century.
D. The toothbrush has changed a lot from the simple device used in ancient Babylonia to the ones used today.
