Which of the following most logically completes the argument?
Notes from an Elderly Man is a family history that dates from the early Song dynasty in China (960–1279), though the author and exact date of publication have been lost. However, the text documents Hu Chen Quan’s rise to power, which took place in 1183, but does not mention the coup that ended his reign in 1195. Thus Notes from an Elderly Man must have been written between 1183 and 1195, given the assumption that _______.