A President entering the final two years of a second term is likely to be at a severe disadvantage and is 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
(E) at a severe disadvantage, often likely to be unable that he or she can
The tested idiom here is "likely to be", so keep that in mind:
a) seems fine so hold it
b) "likely" without the "to", so it's wrong
c) I don't think that "liable to be" even exists
d) because of the use of "that", it would make better sense to have "so" before "liable", but we don't have that, so wrong
e) "often" and "likely" are redundant.
So option A remains as the correct answer.