I did a little research and it looks like the answer is A.
Answer:
When the Soviet Union's oil and gas revenue dropped dramatically, the USSR began to lose its hold on Eastern Europe. Meanwhile, Gorbachev's reforms were slow to bear fruit and did more to hasten the collapse of the Soviet Union than to help it. ... On December 25, Gorbachev resigned as leader of the USSR.
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Answer:
The Communal Award, announced by Ramsay MacDonald on 16 August 1932, ensured the retention of separate electorates for Muslims, Sikhs and Europeans, and considerably increased the limited number of provinces that offered, under the Government of India Act of 1919
The answer to the question above is to reduce air pollution in Mexico city.
In Mexico city, residents have been encouraged to use bicyles in order to reduce air pollution in the city. Using bicycle also helps reduce traffic congestion and decrease time spent on traveling to their destinations.
