Which term describes the period of high birth rates in the United States between 1946 and 1964?

a. Post-war spike
b. Baby boom
c. Fertility optimum
d. Family explosion
e. American expansion

b. Baby boom

The term that describes the period of high birth rates in the United States between 1946 and 1964 is "b. Baby boom."

The correct term that describes the period of high birth rates in the United States between 1946 and 1964 is "b. Baby boom."

To arrive at this answer, you can analyze the different options and eliminate the ones that do not accurately represent the described period.

Option a. "Post-war spike" refers to a period after a war characterized by a sudden increase in something. While the described period does follow World War II, it specifically refers to the birth rate, so this option does not fully capture the context.

Option c. "Fertility optimum" is not a commonly used term to describe this particular period of high birth rates.

Option d. "Family explosion" is not a widely recognized term and does not accurately capture the specific time frame and demographic phenomenon being asked about.

Option e. "American expansion" does not directly refer to the demographic trend of increased birth rates during the period mentioned, so it can be eliminated.

By process of elimination, we are left with option b. "Baby boom," which accurately describes the period from 1946 to 1964 when there was a significant increase in birth rates in the United States.