The correct Answer is b.
The predominant microbes involved in root caries are Actinomyces according to the cited text here. The NIH publication on Diagnosis and Management of Dental Caries Throughout Life claims that convincing data on the source of infection by cariogenic bacteria almost entirely pertain to mutans streptococci.
Caries originating on the root is alarming because:
(1) it has a comparatively rapid progression,
(2) it is often asymptomatic,
(3) it is closer to the pulp and
(4) it is more difficult to restore
OPERATIVE DENTISTRY, 3rd ed. Sturdevant

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