Which is a complex sentence?
they will not defeat their enemy until they come up with a better strategy.
the castle is a fortress, but it does have some weaknesses.
with its calm surface, the moat looked harmless, but it had hidden dangers.
watchful archers hid in the towers, and the soldiers stood ready below.

a question like this requires the excerpt to be included in order to answer the question.

anyone who was dealing with communism in soviet union in his time had an ideal picture of equality, freedom, the struggle of the working class for a better future, the success of the aristocracy's overthrow and the emancipation of subjugation.   however, anyone who would go to soviet union to see the functioning of the communist system, would be convinced that it was about sad people, about everyday bad life, about the brutal attitude of communist leaders, about ill obsession to completely exterminate every thought on aristocracy. thus, orwell wanted to show all the absurdity, the brutality of the system, the unbearable rule of suspicious morality, the ignorant people who try to play professionally.

the answers are: b. and e.