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.ltheguardian.com)