In Latané and Darley's Experiment in Which Smoke Seeped into the Room

In Latané and Darley's experiment in which smoke seeped into the room:

A) participants ignored the smoke at first, and then in just about every case, once the smoke was relatively dense, went to report it
B) even in the condition in which each subject was alone in the room, not all participants left the room
C) participants did not leave the room, but took action to try to block the entry of the smoke
D) when two or more participants were together in the room, they quickly took appropriate action
E) no bystander effect was observed because each subject was personally in a state of possible risk, rather than simply being an observer