Notes from an Elderly Man is a family history that dates from the earl

OFFICIAL EXPLANATION

This is a fairly tricky question. The argument is that Notes from an Elderly Man was written between 1183 and 1195, based on the fact that the book mentions an event that happened in 1183, but doesn't mention one that happened in 1195. In other words, the claim is that the author must not have been aware of that event because it hadn't happened yet; otherwise he would have included it. Right there we have our prediction for the answer: the argument assumes that there is no other reason he did not include this date. What if, for example, he was a lazy historian or perhaps just didn't want to write about an event he did not approve of?
Choice (B) addresses this issue: if we assume that the author's goal was to write an accurate and complete account, then there would be no reason not to include the event from 1195, other than the fact that it hadn't happened yet.
Choices (A), (D), and (E) are diversions; they provide information that isn't crucial to the argument.
Choice (C) is very tempting, but there are plenty of books (historical fiction, for example) about distant time periods. The fact that the book does not mention an event after 1195 does not necessarily mean it was written before then. It could have been written by a historian concerned with the distant past who, for whatever reason, did not cover the coup that overthrew Hu Chen Quan.

Correct Answer choice is B