our department is budgeted for 5 people and we have 10 . ugh . it 's lame . i ' ve been picking up shifts that coworkers do n't want / if they call out sick . i ' m basically on call for the next 2 weeks .

Select from the following.
A). I will be on vacation .
B). We will be really understaffed .
C). I will be studying .
D). It is policy
Answer the following question: What may be the reason I will be on call ?
B).