Rearrange the following five sentences A, B, C, D and E in the proper sequence to form a meaningful paragraph; then answer the questions given below them.
A- A serious conceptual problem often raised about universal disarmament is that even if you succeed in eliminating all nuclear weapons on earth, you cannot eliminate man’s knowledge of the science behind it.
B- The goal of nuclear disarmament provides another motivation for ridding the world of fissile materials.
C- What is to prevent some groups from starting to produce these weapons all over again.
D- That genie is out of the bottle for good.
E- Is nuclear weapon-free world a robust and stable concept?
Which of the following should be the FOURTH sentence after rearrangement?