Difficulty of such questions is that we look for LEAST weakening answer choice. Contenders can be not most weakening but still can be more weakening than correct answer.
in this case B and C are options that we would not choose in simple Weakening question, but if compare with D they are more weakening
in this case B and C are options that we would not choose in simple Weakening question, but if compare with D they are more weakening
