The analysis of how people relate to each other is known as
a. reinforcement
b. human resources
c. anthropology
d. human relations

The analysis of how people relate to each other is known as B. human resources. Human resources has very wide scope especially to industrial setting and this also includes the aspect of people relating one another inside the company and further into becoming productive team players.

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.