Answer:
From 1950 to 2010, the world population increased from 2.5 billion to 6.9 billion, or by 174%. The average annual rate of growth—1.7%—was much higher than in the U.S. In the future, the global population is expected to increase from 6.9 billion in 2010 to 9.6 billion in 2050, or by 38
I believe the answer is A
Railroad technologies
City planners saw a great promise in railroad technologies in resolving the problems facing public transports. As a result, railway transport was immensely integrated into several city public transport systems.
