It is a complex preposition.
The answer is B! its a fact (:
Folklore can be described as the dissemination of any type of information through oral communication or through leading by example. This information will represent the collective ideas of a certain group of people and can be transmitted through mediums such as literature or knowledge. Nowadays the world has morphed into a technologically advanced sphere where all information can be acquired at the touch of a button. This however doesn't change the definition of folklore, it only changes the medium through which we share the information.
Answer: it's B Feldmen kept rigorous data on his business
Explanation: just did the test
