Answer:
A) confluence.
Explanation:
Luther is developing a test of intelligence. He believes that in order to accurately generate an intelligence test score, he must assess a multitude of factors that will be added together to form the "product" called intellect.
This belief indicates that Luther is a strong proponent of confluence.
Washington has been the federal capital of the United States since 1800. Each U.S. state has its own capital city, as do many of its insular areas.
If everyone has a job, then the production and sales of goods and services rise, which means that the GDP rises. That means that the economy is becoming stronger and stronger.