It is hard to create a perfect periodization, but Middle Ages are usually dated from fall of the Western Roman Empire (476 AD) until Fall on Constantinople (1453) or Discovery of America by Columbus (1492)
That is why the option B is correct.
Option A is not correct because it focuses only on the period of Early and High Middle Ages, Option C is related to the Modern period and option A is covering both the part of Ancient History and Middle Ages.
