What Was the Main Finding Latané and Darley's Study in Which

What was the main finding Latané and Darley's study in which they timed how long it took participants working either alone or in small groups to report smoke entering the experimental room

A) Participants working alone reported the smoke more quickly than did the participants working in a group.
B) Participants working in groups reported the smoke more quickly than did the participants working alone.
C) Participants working on a group project reported the smoke more quickly than did participants working on an individual project.
D) Participants were more likely to help when the social responsibility norm was salient.