Answer: A. People moved to U.S cities
Explanation: I hope this helps :) You've got this!
Answer: First Prime Minister of India, Pandit Jawahar Lal Nehru was born in Allahabad Uttar Pradesh on 14 November 1889 and died on 27 May 1964 due to a heart attack.
This is also known as the Prime Meridian.
If you are talking about the first air pollution problem its is A, almost about 100 years ago.
1955
