The answer should be something like this:
how best to allocate scarce resources among competing uses.
Answer:
By using Gateway Arch as the symbol to represent United States expansion policy.
Explanation:
Gateway Arch, which is located in St. Louis Missouri, was designed by Error Saarinen in 1948 and its construction was completed in 1965, costing a whopping is $13million at the time.
It derived its name from "Gateway to west", a slogan used by the US during the westward expansion in the 19th century.
The artist used the Gateway Arch symbol to represent the a door to the western part of United States.
Social change bring two types of changes one is positive change, which helps human life. Other type is negative in direction for which man show his resistance.
It’s B he developed the scientific method
A boon. A boon is a thing that is helpful or beneficial.