70. A President entering the final two years of a second term is likely to be at a severe disadvantage and often unable to carry out a legislative program.

(A) likely to be at a severe disadvantage and is often unable to

(B) likely severely disadvantaged and often unable to

(C) liable to be severely disadvantaged and cannot often

(D) liable that he or she is at a severe disadvantage and cannot often（A）

(E) at a severe disadvantage, often likely to be unable that he or she can

我选了b,答案是a没什么问题，就是不明白为什么likely disadvantaged is less precise than likely to be at a disadvantage.看起来后者似乎还比较wordy.

请nn们指教，ets什么思路？