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】：C
【题目解析】：原句意思为：其中很多都容易遭到盗窃或抢劫。A项的意思不全面。B.钚太有价值了以至于不会被偷抢，与原句意思相反。C.如果不小心守卫钚，就很容易被偷或抢。D.即使小心守卫钚，它还是会被偷或抢。答案为C。