As station officers, what should we do when there are too many passengers waiting for the train on the platform?

A、We should remind passengers to mind the gap between the train and the platform and get on first and then get off.;
B、We should advise passengers to move to the end tail/ head of the platform with fewer people.;
C、We should remind passengers not to force in the train while the doors are closing up.;
D、We should push in all the passengers stuck at the door and make sure that the door could be closed.