Which of the following is an example of positive face threat?

  a.  Jonah tells his manager that he can't be disturbed because he is hard at work on a big report, but his manager later catches him in the break room drinking coffee and telling jokes with his friends.
  b.  Tomas is looking forward to his day off but has to cancel his plans when there is an emergency in the office and his manager tells him he must come to work.
  c.  Isabelle does not understand the jargon that her coworker is using to explain a new system to her, but she nods along as though she does in order to appear in control of the situation.
  d.  Beth is considering calling off work during inventory until her coworker tells her about how their boss yelled at him when he asked for time off during inventory week.

a.  Jonah tells his manager that he can't be disturbed because he is hard at work on a big report, but his manager later catches him in the break room drinking coffee and telling jokes with his friends.