Which of the following circumstances require that a driver not stop at a railroad grade crossing?

[answerhappygod]

Which of the following circumstances require that a driver not stop at a railroad grade crossing?

A. an approaching train is plainly visible and is in hazardous proximity to such crossing
B. a clearly visible electric or mechanical device gives warning of the immediate approach of a train
C. a crossing gate is lowered, or when a human flagmen gives or continues to give a signal of the approach or passage of a train
D. a railroad engine approaching within a approximately fifteen (1500) feet of the of the highway crossing emits a signal audible from such distance and by reason of its speed or nearness to such crossing is an immediate hazard E. all required stops