Iam takings a pre-test, and stuck on this question.

answer: b: supported by key details

explanation:

[why it's not a] - fantasy books exist, and are not supported by history

[why it's b] - why would you write a story about something and give no details about it? if its the central idea of the text, it there will be details about it, whether it's dragons or chemistry.

[why it's not c] - plenty of texts are biased, fact based pieces, such as scientific papers, which are not allowed to have bias.

[why it's not d] - sometimes but not always is the central idea in the title. it often has a piece of the ideas in there, but it near impossible to fit everything you want to say in your text into just the title.

cassius, casca, and their allies plant false documents to manipulate brutus to join their cause to remove caesar. after doing so, they visit brutus at night in his home to persuade him of their views. there they plan caesar's death. brutus is troubled but refuses to confide in his devoted wife, portia. on 15 march, caesar's wife, calpurnia, urges him not to go to the senate. she has had visionary dreams and fears the portents of the overnight storms.

the answer is definitely d. sorry for a late response.