What Was the Main Independent Variable in Latané and Darley's

Multiple Choice

What was the main independent variable in Latané and Darley's experiment on helping in emergency situations?

A) the time that elapsed from the start of the victim's seizure until the participant left the room to get help
B) the participant's level of altruism
C) the number of other people the participant believed had also heard the victim's distress
D) the amount of medical training the participants had before joining the experiment