In his travels Author William Least Heat-Moon stumbled upon the little store in a county names Nameless in Tenessee, eh tehn wrote about this journey he took with his family and when he describes this place he starts off by describing their store, and then Ginny and Thurmond Watts telling him the story of how the name of the county came to be.
The right answer is: B. RE: Stop By My Office Later
The subordinate clause is "you must start researching now"