Answer:
B) The halo effect.
Step-by-step explanation:
The biased that has been exhibited by Jill's supervisor is the halo effect. The supervisor decided that Jill's efficiency was good because he judged him by one trait that he liked about Jill, but that was not related to Jill's performance at work. We can see that the supervisor projected a halo over one trait that expanded to all the aspects of jill.