SOMNATH1812 For Q2 the very first sentence in the RC tells us that Leo is reviewing Rae's work. Going forward as well you can see that Leo keeps talking about what Rae said. Hence the main point will be something about Leo critiquing Rae. That could be option C or D. Since the title of the book is about Urbanism and its end, and Leo does talk about stuff apart from Automobiles, it is option C.
For Q3, what I did was option of elimination.
Q3. If Leo's views as represented in the passage are correct, which of the following would, if true, most help explain why serious traffic and parking problems in certain cities have relatively little, if any, negative effect on those cities' economic success?
See this part of the Passage:
According to Leo, Rae's view that traffic congestion kills cities fails to notice that the most successful cities all suffer from serious congestion, while unsuccessful cities, persuaded by their engineers, build roads in vain, in many cases until there is no city center left. Leo writes: "If we could find one example of an obviously successful city—say London, New York, Tokyo, or Toronto-whose economy was harmed by excess traffic, the road engineers' argument might gain some credibility.
A) Some metropolitan areas are more successful than others in arranging traffic flow to eliminate or significantly reduce traffic and parking problems.
Nothing like this is mentioned. In fact London, New York, Tokyo, or Toronto continue to struggle with issues
B) Some cities that are economically successful and succeed in solving their traffic-congestion problems become even more successful economically.
Nothing like this mentioned either. The struggle has continued.
C) The economies of cities like London, New York, Tokyo, and Toronto are driven primarily by international trade that is little affected by traffic congestion.
Could be the answer, since despite not fixing traffic this helps with improving economies.
D) The roads of New York and Toronto were built much more recently than those of London and Tokyo.
Doesnt tell us anything. Wouldnt matter for how traffic and parking problems affect the city.
E) Many successful cities do not have traffic congestion or parking problems.
Goes against the premise of the Question.
Hence C should be the answer. Hope that helps.