Hurry I need the right answer ASAP Its a timed test Which best describes the policy of containment?

dividing a country into different sections
advancing militarily against communist countries
limiting the spread of communism to new countries
being unable to reach agreements with other countries

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .

answerjames-lange theory;