Use Case B to Answer the Following Questions

Use Case B to answer The Following questions
CASE B
A 48-year-old woman is being treated by the dental hygienist for the first time. She states that she is in very good health. Clinical examination reveals generalized bleeding of the gingiva with generalized rolled margins, bulbous interdental papillae, and no signs of inflammation of the attached gingiva. A 1-mm zone of attached gingiva on the facials of the mandibular central incisors and a class I furcation on the facial of tooth #30 are noted. She has a 7-mm clinical attachment loss reading on the facial of #30. Radiographs do not reveal the furcation, but a radiopacity that is continuous with the coronal enamel and extends into the furcation is noted. No other attachment loss or bone loss is noted throughout the mouth. Occlusal evaluation reveals no premature contacts or signs of tooth wear.
-The bottom of the gingival sulcus is marked by the:

A) Marginal gingiva
B) Junctional epithelium
C) Alveolar crest
D) Sulcular epithelium
E) Periodontal ligament