The Plaque Biofilm Associated with Juvenile Periodontitis Is Present in Small

The plaque biofilm associated with juvenile periodontitis is present in small amounts considering the severity of the periodontal defects because:

A) All of the plaque biofilm is supragingival.
B) The primary pathogen in the biofilm does not create much extracellular matrix.
C) The primary pathogen creates extracellular matrix that forces the bacteria out of the pocket.
D) The primary pathogen creates a significant amount of extracellular matrix, leaving no space for bacteria to grow.