A. Indiscipline should have not encourages by us.
B. Indiscipline should not be encouraged by us.
C. Indiscipline should not being encouraged.
D. Indiscipline should not been encouraged.
The given sentence contains one of Model verb (Model Verb = will, shall, can, may, might, could, might, must, would). It is in active voice.
Rule :
Subject + Model verb + be + V3 + Optional Objects.
