A patient complains of sensitivity in a Mandibular premolar. A well condensed class V amalgam restoration was placed in that tooth 5 months ago, with no discomfort for the first 4 months. Since then it has become increasingly sensitive. The problem probably relates to:
(A) Marginal leakage (B) Fractured restoration (C) Irreversible pulpal damage (D) Tooth brush abrasion
(C) None