设立国家安全委员会主要基于哪些方面的考虑（）

A.对外维护国家主权、安全、发展利益

B.对内维护政治安全和社会稳定

C.进一步推动经济建设

D.加强社会建设和社会治理创新

Nuclear fusion is a process whereby the nuclei of atoms are joined, or "fused," and in which energy is released. One of the by-products of fusion is helium-4 gas. A recent fusion experiment was conducted using "heavy" water contained in a sealed flask. The flask was, in turn, contained in an air-filled chamber designed to eliminate extraneous vibration. After the experiment, a measurable amount of helium-4 gas was found in the air of the chamber. The experimenters cited this evidence in support of their conclusion that fusion had been achieved.
Which one of the following, if tree, would cast doubt on the experimenters’ conclusion

A．Helium 4 was not the only gas found in the experiment chamber.

B．When fusion is achieved, it normally produces several byproducts, including tritium and gamma rays.

C．The amount of helium 4 found in the chamber’s air did not exceed the amount of helium 4 that is found in ordinary air.

D．Helium 4 gas rapidly breaks down, forming ordinary helium gas after a few hours.

E．(E) Nuclear fusion reactions are characterized by the release of large amounts of heat.