Answer:
Option: obtained new resources, technologies, and machinery
Step-by-step explanation:
Industries in 1920 increased their productivity for several reasons, including new machinery which transforms the cities. In 1920 more industries were coming up. Technologies were developing rapidly, which led to rapid economic growth. Locomotives helped in supplying raw materials and transport goods at an affordable price and in less time. Assembly lines play a role in 1920 by increasing productions.