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Which option completes the text below correctly?
A Beijing company has unveiled spectacularly futuristic designs for a pollution-busting, elevated bus
[...] Song Youzhou, the project's chief engineer, claimed the busses could be produced for 20% of the price of an underground train and rolled out far more quickly since the _________ infrastructure was relatively simple.
The project has been greeted with _________ in China, where traffic jams have grown as the country _________ the United States to become the largest car market on earth in 2009.
However, _________ over the _________ was tempered by the fact that a virtually identical contraption was unveiled at the same expo in 2010 without catching on. Its _________ ? A Chinese engineer by the name of Song Youzhou.
(Adapted from https://www.theguardian.com)