Fortunately I got this one right, I was able to eliminate C and D since the questions relating to downtown congestion fall out of the causal chain, and E as well since it confuses sufficiency for necessity. It still took me a few minutes and I had to map out the logical relationship on paper, doing this under time constraints is gonna be a challenge.

Same here, I guess I misinterpreted the word "universal" in the first sentence of the stim.