Green Earth, an Environmental Organization in Oklahoma, Recently Recruited Phyllis

Green Earth, an environmental organization in Oklahoma, recently recruited Phyllis Galvan as a project coordinator. Galvan's manager has noticed that ever since she has joined, she has been extremely positive about her work and takes up challenges without complaining. In addition, she maintains a positive ambience by helping out colleagues and smiling at everyone she interacts with. Her behavior has had a positive effect on her colleagues, who have started behaving in a similar manner. Which of the following concepts is demonstrated in this example?

A) emotional dissonance
B) Ben Franklin effect
C) unit bias
D) anchoring effect
E) emotional contagion