Answer:
B. highways
Explanation:
Rivers are indicated as blue lines in maps.
Washington is a state not a country, it is part of the country; the United states.
B because since this means that humans no longer have to travel, since they can do things like farm on a regular basis.
Extra-
Choice A would be incorrect because it's the opposite of what the ability to acquire food on a regular basis. They can control and alter the environment to do things like plant. Choices C and D have nothing to do with the ability to acquire food on Ba regular basis.
In US during the 1800s there was urbanisation taking place in the cities and with the increasing urbanisation and industrialisation many great job opportunities increased in the cities.
Immigration took place, people migrated from different regions in search of jobs and they were given many fruitful jobs in the cities. Due to the increase in labour many new industries opened up and new job opportunities were created. With the increase in urbanisation, industrialisation increased, which increased jobs and democracy in US.
