Certain painkilling drugs such as Oxycotin have recently been shown to

Certain painkilling drugs such as Oxycotin have recently been shown to be addictive to patients, which may limit their potential to reduce pain.


(A) which may limit their potential to reduce

(B) which may limit their potential for reducing

(C) which may limit such drugs potential to reduce

(D) an effect that may limit their potential to reduce

(E) an effect that may limit the potential of such drugs to reduce