When historians begin to research a topic they may do all of the following except:
a. examine photographs
b. examine primary-source documents
c. interview people who might have witnessed a particular historical event
d. conduct experiments on various people who witnessed a particular historical event

lee and grant, both of whom held the highest rank in their respective armies, had known each other slightly during the mexican-american war (1846-48) and began their dialogue by exchanging awkward personal inquiries. characteristically, grant had arrived in his mud-splattered field uniform while lee had turned out in full dress attire, complete with sash and sword.

explanation: