Answer:
I think that is China I am not sure
The best answer to go with is b
Explanation/Answer:
Among Russia's most important environmental problems: Water pollution is the most serious concern. Less than half of Russia's population has access to safe drinking water. ... Air quality is almost as poor as water quality, with over 200 cities often exceeding Russian pollution limits, and is likely to worsen.
As my memory serves me well, innovations like the production of gunpowder, tea, and silk are usually attributed to D. China
