Much of it could be vulnerable to theft or hijacking.

Much of it could be vulnerable to theft or hijacking.

A.The plutonium is so vulnerable that it's easy to be stolen.

B.The plutonium is too vulnerable to be stolen and kidnapped.

C.If the plutonium were not carefully guarded, it might be either stolen or kidnapped.

D.Even if the plutonium were carefully guarded, still it would be stolen or kidnapped

正确答案是C