21. Given below are four jumbled sentences. Pick the option that gives their correct order.
P. If you look at Britain, for example, people don’t work in coal mines, where they don’t see daylight for weeks and explosions are part of everyday life.
Q. Most people now work in air-conditioned offices.
R. So, technology over the long run is an extremely positive thing, but it can create short-term disruptions.
S. If you look at history, it has been overwhelmingly positive in terms of technological progress.