题目:in his research paper, Dr. Frosh, medical director of the Payne Whitney Clinic, distinguishes mood swings, which may be violent without their being grounded in mental disease , from genuine manic-depressive psychosis.
B. mood swings, perhaps violent without being grounded in mental disease, and genuine manic-depressive psychosis
OG对B的perhaps的解释是 the phrase perhaps violent ... is awkward and unclear,