Firstcomers to a Forum Discussion Are Most Likely to Cause

Firstcomers to a forum discussion are most likely to cause problems by

A) using strong,rigid language that does not foster discussion.
B) complaining or blaming others for the problems the team is having.
C) challenging the team's hard-earned consensus and damaging morale.
D) directing the discussion off topic and wasting valuable time.
E) stating their opinion but failing to take part as the conversation evolves.