One of MrBluestone's Colleagues Decides to Call in Sick and Skip a Skip

One of Mr.Bluestone's colleagues decides to call in sick and skip a professional development workshop, even though she is not ill.At the workshop, the principal asks Mr.Bluestone about the colleague's absence.He cannot decide whether to tell that he knows she is not sick.Mr.Bluestone is facing a conflict between

A) long-term and short-term considerations.
B) truth and loyalty.
C) justice versus mercy.
D) courage versus deliberation.