Rogers Syndrome (RS) is an inflammation of the rotary cuff of the shoulder. Until recently, it was thought that RS was caused by over-rotation of the shoulder joint. Recently; however, tests in mice conducted by a group of researchers revealed a gene that causes RS-like symptoms. The researchers concluded that, therefore, it is likely that RS has a genetic component.
Which of the following, if true, would cast the most doubt on the researchers contention that it is not solely over-rotation of the shoulder joint that causes RS?
(A) The RS-like symptoms in mice abate when treated with a particular combination of drugs.
(B) The mice selected by the researchers have been used in a variety of studies that resulted in meaningful results.
(C) After the mice developed the RS-like symptoms, the researchers only observed them for three weeks.
(D) The researchers in question have been studying RS for only two years.
(E) The symptoms of RS are similar to, if not identical with, the symptoms of one or more other syndromes or conditions.