Meursault compared the jurors in his trial to a group of people on a streetcar because <u><em>people on a streetcar are complete strangers who are indifferent toward each other while they are along for the ride.
</em></u>
The correct answer in the last one.
People in a streetcar and people in a jury can be compared because they share a specific moment in life, but they are not related with each other nor they know anything about each other's life.
A peer is someone as having the same ability as another person, so if writers meet with other writers (their peers) and get feedback - they review one another's work - peer review.