John Smith provides information on the conditions that lead women to a gynecologist, and he notes that these conditions can, and sometimes are, used in the promotion of surgery which is not needed.
(A) and he notes that these conditions can, and sometimes are, used in the promotion of surgery which is not needed
(B) noting that these conditions can be, and sometimes are, used to promote needless surgery
(C) and notes that they could and sometimes are used unnecessarily in promoting surgery
(D) sometimes promoting needless surgery
(E) which they use sometimes to promote unnecessary surgery
A lacks of "be" after the second "," --> out
C lacks of "be" after "could" --> out
D what "promote" is the "conditions", not John smith--> out
E "which" modifies "the conditions" , not "a gynecologist" --> out
B is fine.