What would you do in this situation?

I say "A" or "B" - it would depend on how desperate I was to get on that streetcar. If I was desperate and didn't care if the people talked about me, I'd push them out of my way. If I had some time to be polite, I'd wait until they moved on their own. But, all this said, if no one moved I'd be pushing them out of my way. I'm not on the streetcar to make friends - I'm there to get a ride, just like all of them and I have the same right to be on that car as any one of them does!!