Which of the following reflects a “boom” phase in a capitalist economy?
a. production increases and spending on goods is low.
b. employment, profits, and incomes are high.
c. demand is high, supply is high, and employment is low.
d. employment, profits, and incomes are low.

The option that best reflects a "boom" phase in a capitalist economy is B. Employment, profits, and incomes are high. In a capitalistic economy during the boom phase, the economy grows in every possible aspect. Jobs are plentiful, and the market brings high returns to investors. Individuals and businesses can borrow money easily and cheaply.

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.