5. a dangling modifier is a a. phrase that has nothing to modify in a sentence. b. group of words in the wrong position in a sentence. c. detail that provides information about the wrong subject. d. word that's unnecessary to the rest of the sentence's meaning.

the correct answer is the first option "the bolkshevik revolution". the passage makes reference to many of important events that occured in the revolution, such as the assemblies, in this case the animals are gathered in an assembly after a protest, the murder of fellow partners, the speeches given by the leader of the revolution, among other aspects. the last choice is possible, but in this passage in particular it is not emphasized the fight between the characters, that is the two pigs, that represent lenin and stallin.