What does the author mean by “diffusion of responsibility” (Line 4, Para. 3)?
A : The more people are around, the more they need to worry about their personal safety
B : The more people who witness an event, the less likely anyone will venture to participate
C : The more people idling around on the street, the more likely they need taking care of
D : The more people are around, the less chance someone will step forward to intervene
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