Which of the following is the best example of mockery as a tool of discriminatory treatment in organizations?

a. because she is considerably older than the rest of her team, hannah's colleagues often do not invite her to team lunches or informal team get-togethers.
b. rifka's supervisor often stereotypes rifka because of her ethnic heritage and makes jokes about her ethnicity.
c. sheena is the only african-american employee in her department and often feels left out of office jokes and gossip.
d. most of leanne's co-workers are male and share inappropriate jokes at the office.
e. joan's boss sets impossible targets and reprimands her in front of her colleagues if she fails to complete them on time.