The correct option is B is
The subject of the sentence, Gulliver's Travels, is a singular identity, and thus, the auxiliary verb following it will also be in the singular form. Since a timeline is not mentioned, we can assume the tense to be simple present, talking about the subject in general. Option B, is, is the only singular verb, fitting the tense criteria in the given verbs, and is thus the correct answer. Hence, Options A,C and D are incorrect.