Bacteria That Cause Periodontal Disease Have Adhesins for Receptors on Streptococci

Bacteria that cause periodontal disease have adhesins for receptors on streptococci that colonize on teeth. This indicates that

A) streptococcal colonization is necessary for periodontal disease.
B) streptococci get bacterial infections.
C) streptococci cause periodontal disease.
D) bacteria that cause periodontal disease adhere to gums and teeth.
E) bacteria that cause periodontal disease adhere to teeth.