Shahida Was Anxiously Awaiting Word as to Whether or Not

Shahida was anxiously awaiting word as to whether or not her job with Minsk Denturists was going to be eliminated.She had been a loyal and reliable employee over the past ten years,helping to grow the company from one location to a multi-branch operation,spread over several provinces.Now she was told that the company intended to reduce their workforce in order to improve organizational efficiency,productivity and competitiveness.She thought that this might be a new focus for the organization,since she had heard from her friend in the mailroom that the organization was recently handed down from the original owner to his two sons.She couldn't stand not knowing anymore,since she the sole provider for her elderly mother.
-Shahida's information source in the mailroom would be an example of the use of

A) the grapevine
B) the informal complaint line
C) open-book management
D) social media
E) the rumour mill