According to the passage, all the following aspects of the historical development of finance have been covered in professor Ferguson's book EXCEPT:
Presence of ubiquitous commodity trading in Mesopotamian societies.
Refer to the third paragraph. The reviewer says that the book mentions clay tablets that were used as credit notes for commodities in the pre-Christian Mesopotamian societies but does not say whether or not commodity trading was widespread in these societies. Points mentioned in all the other options (A to C) find a mention in the book.